I would probably recommend a Macbook Pro. Here's why:
Since last summer's release of the new Macbook Pro models, they've pretty much been well worth the money in hindsight and currently with the new models (though not as valuable as last year's release). Here's why I think so (lol I got some weird formatting going on):
1. Last year's models (specifically the 15" models) came in a $1999.99 and $2499.99 pricing variety, with the main difference being the GPU RAM coming with the laptop in a 128MB and 256MB variety (I believe the clock speeds were the same, and it's MB, not mb (megaBYTE vs. megabit memory--and as we all SHOULD know, video ram makes an insignificant difference if the textures (most games at the time and presently don't benefit the user through the difference in video ram, especially when dealing with screen resolution, which I will get to in another point)). They were the first, or if anything, one of the first laptops to come out with the nVidia Geforce 8xxxM series (M for mobile) GPUs for laptops, and that was huge value considering the price, what you get overall, and the condition of the market at the time.
2. The new models that came out a couple months ago came with better CPUs (not a whole lot faster, but overall better CPUs without diving into the specs of it) and a vram difference of 256MB vs 512MB (the 512MB doesn't seem worth the $2499.99 since the card didn't really change that much, and that the vram most likely won't benefit much for gaming because of the limitations of the card itself. If one were photo/video editing with gaming as a hobby, then it may be worth it.) Despite the modest upgrades in specs from the previous 9-month old release, it's still not a bad buy taking all things into consideration.
3. OS X should be a casual user's best friend because of the low maintenance and software it provides. If one doesn't like using it much, just use bootcamp (if you're only doing this now but don't have OS X 10.5+ (Leopard), then roll back your clock in OS X to 2007 before using a bootcamp beta meant for Tiger to save yourself the extra cash from upgrading to Leopard), install XP or Vista (whatever your flavor is), and use that as your primary boot.
4. Problems with drivers for Windows? For XP (Home, Pro, Media Center), the only problem I've come across were some blue screens related to some sound drivers in older games (primarily Warcraft III), but a simple change in settings or having the latest version of bootcamp (that came with Leopard) will remedy this problem (or changes in settings for other games if it were to occur). Other than that, bluetooth and everything works perfectly, and if anything, very fast compared to traditional PC-laptops. The apple drivers for the hardware are very reliable and well made (I can vouch for this with many more technical reasons).
5. The native-resolution-to-GPU combination is perfect. You can max out your resolution at 1440x900 (It's not the largest resolution one can get out there), but considering the card is only a 8600M GT, 1440x900's perfect for running many games and applications at this resolution while keeping other quality settings high.
I know I was quite unorganized in this post, but when you look at the market and what it offers, the macbook pro's actually a good buy (less now than before, but it's still good). Apple's tech support has recently been rated (I don't have my source now, but you can find it on your own) the best out of all there is out there, and is very easy to deal with. As far as hardware reliability, there's still roughly a 1 in 5 (20%) chance that something will go wrong in it's lifetime (shared within the 20-25% chance that all manufacturers face--this statistic can be found in the same source that rated Apple's tech support), Apple's customer service should be able to take care of that with the proper pre-purchase planning (I don't think they offer hardware service plans, but they're very lenient) and care when handling.
For a mid-to-high end GPU (despite the 9xxx and 10xxx series currently out) and great CPU option, the performance in gaming is outstanding, while not defeating the purpose of having a mobile computer at the same time (battery life's above 2.5 hours when pushed, on average 3.5 hours, and the overall product's awesome). If you want an SLI set up, get a desktop. SLI, RAID (multiple hard drivers overall actually), and even quad-core CPUs can't provide good battery life or heat ratings at the moment, and usually cost a fortune.
Well, that's just my opinion lol. If anything, I talk about this stuff for a part-time job (CA position at Best Buy) and plan to move to Apple p/t while maintaining my business that requires similar thinking and going to school (2nd year now lol). Lots of people/customers have liked what I said, so I decided to share it here.
meow~