I got a question regarding the the xbox 360 elite and my pc?

now i bought a really good computer (embled) which has a core 2 quad processor 4gb ram 750 gb hdd and 1gb vga so far i can play any game out there in the market except those certain games which arent released for the pc example ins creed 2 which i have to wait till 2010 the pc cost quite alot and i was wondering so far the xbox 360 seems the most economic console out there the games dont cost too much and every game so far comes out for it and its only $299 :O my computer was around $1000 which im not sure since i live in sri lanka costs rs80, 600 well nvm that but what my question is is that should i buy the xbox 360 ? even though i have a really good computer ?