1) Your laptop will run GW2, albeit not on Max settings (at smooth framerates anyway) but with a mixture of stuff. You need to tweak individual settings and see which have the greatest impact on framerates and less impact on visuals. Stuff like Shadows and AA is pretty taxing, start with those. People with worse laptops are running the game fine
2) Hmm I usually ask the person's budget and work backwards from there, but you want something that will max-out Crysis 3. Well considering the game isn't even out yet and tweaks are constantly being made (I participated in both the Closed Alpha and Open Beta) and for the most reasons a single high-end GPU will get you what you're after. If you want to go higher than 1080p, or want more than 60fps (120hz monitor?), or want ridiculous amounts of AA then a single GPU won't cut it.
In any case I will recommend 2 builds assembled by me from PCPartPicker - one in the "sane" region, where you can get the game looking mostly great and playable, a bang-for-the-buck build...and one in "oh jesus balls" region, where you can truly max it out and keep the PC futureproof for a while. An SSD is included in both builds because once you get a taste of it, you'll never want to go back...and anyway with their prices lower than ever it would be foolish not to get one
The "sane" build...
PCPartPicker part list [http://pcpartpicker.com/p/E05c] / Price breakdown by merchant [http://pcpartpicker.com/p/E05c/by_merchant/] / Benchmarks [http://pcpartpicker.com/p/E05c/benchmarks/]
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor [http://pcpartpicker.com/part/intel-cpu-bx80637i53570k] ($189.99 @ Microcenter)
CPU Cooler: Corsair H60 54.0 CFM Liquid CPU Cooler [http://pcpartpicker.com/part/corsair-cpu-cooler-h60cw9060007ww] ($64.99 @ Newegg)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard [http://pcpartpicker.com/part/asrock-motherboard-z77extreme4] ($119.99 @ Amazon)
Memory: Mushkin Blackline 8GB (2 x 4GB) DDR3-1600 Memory [http://pcpartpicker.com/part/mushkin-memory-996988] ($56.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive [http://pcpartpicker.com/part/western-digital-internal-hard-drive-wd10ealx] ($77.98 @ SuperBiiz)
Storage: Samsung 830 Series 128GB 2.5" Solid State Disk [http://pcpartpicker.com/part/samsung-internal-hard-drive-mz7pc128bww] ($124.95 @ Mac Connection)
Video Card: Asus GeForce GTX 670 2GB Video Card [http://pcpartpicker.com/part/asus-video-card-gtx670dc22gd5] ($379.99 @ Newegg)
Case: Corsair 400R ATX Mid Tower Case [http://pcpartpicker.com/part/corsair-case-400r] ($99.98 @ Newegg)
Power Supply: Corsair Professional 650W 80 PLUS Silver [http://pcpartpicker.com/part/corsair-power-supply-cmpsu650hx] ($99.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer [http://pcpartpicker.com/part/lite-on-optical-drive-ihas124-04] ($17.99 @ Newegg)
Total: $1232.84
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-16 22:14 EST-0500)
Not bad eh? Lots of bang for the buck here.
And here's the oh-jesus-balls build...
PCPartPicker part list [http://pcpartpicker.com/p/E0bV] / Price breakdown by merchant [http://pcpartpicker.com/p/E0bV/by_merchant/] / Benchmarks [http://pcpartpicker.com/p/E0bV/benchmarks/]
CPU: Intel Core i7-3770K 3.5GHz Quad-Core Processor [http://pcpartpicker.com/part/intel-cpu-bx80637i73770k] ($229.99 @ Microcenter)
CPU Cooler: Corsair H80i 77.0 CFM Liquid CPU Cooler [http://pcpartpicker.com/part/corsair-cpu-cooler-h80i] ($84.99 @ Newegg)
Motherboard: Asus SABERTOOTH Z77 ATX LGA1155 Motherboard [http://pcpartpicker.com/part/asus-motherboard-sabertoothz77] ($234.57 @ Amazon)
Memory: G.Skill Sniper Series 16GB (2 x 8GB) DDR3-1866 Memory [http://pcpartpicker.com/part/gskill-memory-f31866c9d16gsr] ($99.99 @ Newegg)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive [http://pcpartpicker.com/part/western-digital-internal-hard-drive-wd1002faex] ($89.99 @ Microcenter)
Storage: Samsung 830 Series 256GB 2.5" Solid State Disk [http://pcpartpicker.com/part/samsung-internal-hard-drive-mz7pc256dam] ($219.99 @ Newegg)
Video Card: Asus GeForce GTX 670 2GB Video Card [http://pcpartpicker.com/part/asus-video-card-gtx670dc22gd5] (2-Way SLI) ($379.99 @ Newegg)
Video Card: Asus GeForce GTX 670 2GB Video Card [http://pcpartpicker.com/part/asus-video-card-gtx670dc22gd5] (2-Way SLI) ($379.99 @ Newegg)
Case: Corsair 600T Mesh (Black) ATX Mid Tower Case [http://pcpartpicker.com/part/corsair-case-cc600tm] ($139.99 @ Newegg)
Power Supply: Corsair Professional Gold 850W 80 PLUS Gold [http://pcpartpicker.com/part/corsair-power-supply-cmpsu850ax] ($169.99 @ Amazon)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer [http://pcpartpicker.com/part/lite-on-optical-drive-ihas124-04] ($17.99 @ Newegg)
Total: $2047.47
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-16 22:23 EST-0500)
Of course a lot of the parts from the above two builds can be mixed n' matched. Feel free to ask anything more
edit: Oh and here's some peripherals/extras, stuff you may or may not need, as you can see I've recommend a bunch of things depending on what you're after.
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) [http://pcpartpicker.com/part/microsoft-os-gfc02050] ($89.98 @ Outlet PC)
Monitor: Asus VH236H 23.0" Monitor [http://pcpartpicker.com/part/asus-monitor-vh236h] ($149.99 @ Newegg)
Monitor: Dell U2412M 60Hz 24.0" Monitor [http://pcpartpicker.com/part/dell-monitor-4691137] ($328.98 @ Newegg)
Monitor: BenQ XL2420T 120Hz 24.0" Monitor [http://pcpartpicker.com/part/benq-monitor-xl2420t] ($389.99 @ Amazon)
Keyboard: Corsair Vengeance K90 Wired Gaming Keyboard [http://pcpartpicker.com/part/corsair-keyboard-ch9000003na] ($113.00 @ Newegg)
Keyboard: Cooler Master Storm Quick Fire Pro Wired Gaming Keyboard [http://pcpartpicker.com/part/cooler-master-keyboard-sgk4010gkcr1us] ($94.31 @ Amazon)
Mouse: Logitech G9x Wired Laser Mouse [http://pcpartpicker.com/part/logitech-mouse-910001152] ($54.99 @ Newegg)
Mouse: Logitech G400 Wired Optical Mouse [http://pcpartpicker.com/part/logitech-mouse-910002277] ($29.99 @ Newegg)
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-16 22:40 EST-0500)
Audio stuff (headphones, speakers, sound cards) are not something I will cover unless you specifically ask me to. I believe no PC gaming experience is complete without a solid audio setup, but not everyone feels that way.