Hey, I've nearly got enough money to buy an xbox 360 (£257!) but I'm thinking whether it would be wiser to wait until next year so I can:

1.) Be sure of getting one
2.) See how PS3 and Rev do
3.) Probably get one cheaper

Instead, I could upgrade my PC to last a few years or so (e.g new graphics card) because I only have a poor Radeon 9600 vanilla and could then properly enjoy BF2, X3 ect. I can play these, but only at 1024x768 (i have 1280x1024 monitor). What do you think? Please state why you think I should get one now or wait. Thanks in advance!

Considering the rather weak launch line-up for the XBOX360 I'd wait for that.
Whether to upgrade your computer all depends on whether you play on it a lot, if yes, then go for it :)

I play on my pc a lot so yeah. I can either get:

1.)GeForce 6800 GS Extreme Edition
2.) Powercolour X800 GTO (Cheaper)

i would suggest an upgrade over the 360. upgrade ur comp now buy a ps3 then and then upgrade ur comp again.. ps4 etc etc