8800GT is the same as 9800GT stop now!!!. 9800GT is cooler and power energy efficiense.
Performance is almost identical.
If you wonna get something better than a 8800GT, go and buy Ati 4870 or GF9800GTX+ 20-35% faster than a 8800/9800 GT.
And if you are a extreme player go for GTX 295 or Ati 4870x2.
8800GT will do fine if you have a dual core / core 2 duo.
If you buy a Quad core or a i7 then you should buy a good video card or just buy the 8800GT and wait some time to change for a good SLI GPU system...
blabla