Worth Upgrading?

[Jono]

Not posting this in GH or wherever because i'm just interested in the latest/up-and-coming releases...

Anyway, here's what i currently have
AMD X2 3800
2GB of some kind of corsair(?) 3200 DDR (???)
Asus A8R32 MVP deluxe
Ati X1900 XTX
Win XP Pro (not sure I want vista)

Stuff like crysis demo ran... ish... with the stuff in that set to "high", But kinda jerky.
TF2/EP2 run fine of course,
ETQW looks a bit pants, and i'm not convinced it's terribly smooth

I want to be able to run Crysis looking rather nice, and I'm getting UT3.

What are my options for upgrading?
Don't want to spend any more than £800. I guess I'm looking at gfx/cpu/mem/mobo, really.

I don't need KB/Mouse/Monitors (although my 18" dell thing from about 4 years ago is looking a little old...) Speakers etc.. got everyhing (although my speakers are a bit turd. I have an Audigy 2 sound card, which seems to work - certainly better than the onboard thing. Whatever THAT is.

Don't want to spend any more than £800. I guess I'm looking at gfx/cpu/mem/mobo, really.

 

[Jono]

What's the difference in GT and GTX (which you have?) other than about £150?

 

[Jono]

Would two GT8800s in SLI be worth it? If not, maybe I could get a nice new monitor... or maybe get a new monitor now, then another GT later for SLI goodness

 

[Jono]

I *think* my PSU should be able to handle it - i'll have a clamber around in the attic to find out what it is. Insane resolutions = never.... so I think I'll just stick with a single card.

 

[Jono]

Also, why that particular GT? why not ones that are in stock, and when's that released?

**
My PSU is an
Enermax Noisetaker EG701AX-VE(W)SFMA 600watt Power Supply