New releases - get on PC or 360?

I would get them for the 360. But I'm a console gamer.

Far Cry 2 and Fallout 3 might be a bit taxing on your PC and both are primarily single player games, so I'd say 360 for those. (FC2 does have MP, but I assume you're mostly interested in the SP part of that game) I've heard that the console version of Left 4 Dead is clunky and doesn't control very well, so I'd recommend getting that on the PC. That way you don't have to pay for a Live! subscription and you can still enjoy the other 2 more powerful games in all their glory. (or at least as good if not better than you could on your PC)

All shooters on PC

everything else 360.

The only one that I would definitively get on PC is Left 4 Dead.

The other two are based on your preferences - people like me who think the PC is best for shooters will choose PC. If you value graphics, then go for the HDTV.

It's your decision, pretty much...

I would recommend Left 4 Dead for the PC...I've heard good things about it on 360, but it will always be a PC game first. The other two games will be fine on the 360 and you should get them for the 360 unless you plan on upgrading your PC.

The thing is I want to use the multiplayer on Far Cry 2 as well so I would need live if I got the 360 version.

The only one I'm considering is Fallout. My current PC isn't as powerful as my 360, but I don't want to miss out on mods like I did with Oblivion.

I say go for the 360. Then again, I'd say that no matter how good your specs were...

I'd recommend 360 depending on how many friends you have. To me it's just easier to hook-up and hang-out with friends on the Xbox.

"The thing is I want to use the multiplayer on Far Cry 2 as well so I would need live if I got the 360 version."

I am not sure what to do, it seems to me:

PC  plus points - Free content, cheaper, have friends play on them.
PC bad points - Compatability, no fully interegrated system like Live which is used in all games that my friends use, may need an upgrade next year.

360 plus points - live, friends use it, some exclusives at the moment the PC doesnt have for a while.
360 bad points - expensive compared to the PC versions of games, need to buy live, content is charged for more often than not and uses the points cards which hides the costs of games.

I'm planning on getting Fallout 3 for the PC, and maybe some of the shooters that are coming out for either one.  My graphics card isn't the greatest (lower than yours). But for me, the deciding factor is what is easier to play with friends (for the multiplayer stuff). That's the only reason I got CoD4 for the 360.

Thats my issue, the set up on Xbox 360 is easier than PC for playing friends online etc but the price is also £10 more which is about $16 USA.