Taking into account that you have a good gaming PC is very important, sadly people here are ignoring that comment.
Eg. Gears of War and Bioshock are both out for the PC so they can't be counted as reasons to buy the Xbox360 and UT3 isn't a reason to buy a PS3 ect.
@ OP
I think Twestern has a great system for this
If the cost of all the games you want to buy for the Console is greater then the cost of the console it's self then buy it.
if ∑G > C then
Buy = true
Else
Buy = False
End if
Another thing you have to decide is if you don't mind using a gamepad for the games your thinking of getting.
In the end GTA4 is most likely will be released for the PC, will be cheaper and might look even better on your powerful computer.
Playing : PC AOE, DiRT 2, Runes of Magic, Wings of Prey & Planetside 2
Wii U : Nintendoland, Super Mario U & Fifa 2013 demo
DS : Guitar Hero : On Tour
Formerly unknown as Vengi
