Over on Toms Hardware guide thy have a roundup review of about 46 different video cards. One of the games used to benchmark the cards was BF1942:SWOWW2 I thought that comparison was relevant here since it uses the same game code we use and would in my opinion be close to a real world results. http://www.tomshardware.com/graphic/20031229/index.html
here is a gif of the card tests
All tests were done on a P4 3.2GHz system
My GF4 Ti4200-128MB should produce about 90fps
The Radeon 9800SE I am looking at does about 144fps
The Geforce FX 5900XT I am also looking at does close to 183fps
I also noticed as you get toward the top end the differences in performance are less significant.
Yeah thanks ive had a look there also, great site, I recommend you all go there ;)