I started playing Stalker Clear Sky last night and I was disappointed that my 768MB Geforce 8800 GTX only gave me 21 fps in the Clear Sky base.  I started playing the Swamp level and it got to between 30 and 50 fps but i'm still disappointed.
I started to eye up a 1GB Geforce 280 GTX (overclocked) and I would have ordered it while I was at work but the credit card details on the site are wrong. :(
Now it's gotten to the point where i'm not too sure that I should get it, although it's one of the best cards out there at the minute.  It's even cheaper than my 8800 GTX was, by about £50 :o

What should I do?