Just so you know, EVERY SINGLE ONE of those PC games you mentioned are out for the XBOX 360, and the following of them are EXCLUSIVELY 360 (by exclusive I mean just 360 and pc)
Fable.
Fallout 3 (came to PS3 Later)
Bioshock (came to PS3 later)
Mass Effect
Assasins Creed (came to PS3 later)
Prototype
So if you want games like these (and sometimes exclusively, sometimes year(s) earlier than the other consoles) get a 360, the xbox 360 also has the best online service, DLC commonly comes out earlier (sometimes by over a year) on the 360 than the PS3, and there are more people actively playing on xbox live than on Playstation Network (since PSN is free, almost all PS3 owners have it, so the numbers may suggest more people use PSN, but trust me, the number of ACTIVE players is much higher on the 360)
the point is, I would HIGHLY recommend the 360, but if you go with the PS3 that would not be a tragedy
do NOT get a wii, they have a much much lower number of games like the ones you listed above, barely any at all
PS: Before the PS3 fanboys attack me, I respect the PS3, hell, I own a PS3 (granted it is collecting dust) and as an owner of all three consoles, my xbox 360 has seen more than ten times the use of both of the other consoles combined. So sorry PS3 fans, the 360 has just catered to my playstyle much more (and I have played and enjoyed EVERY game on the list you supplied OP, so I think we have similar tastes)