I would like to stick with the same brand of cards(Radeon)that were origanlly with my CPU when i bought it so i wont VOID the warrenty on the computer.
Get what you want, regardless of the brand. You Voided the warranty the minute you split the case and broke the tape saying "Splitting this case and breaking the tape voids the warranty"
Having said that, I saw an earlier post saying you were off to better things via WW2online? What works best here may not be best there. First thing you should do is figure out what you will spend your prime time in.
I have found, however, that the past few ATI cards I've ran have been the better for me. Running 9700 pro Radeon at the moment, with 1.2ghz ram and AMD CPU.
Can't argue with the 70 frame rate in a furball. Not sure how it will stackup in WW2online though, having spent just enough time in that game to not care how it ran there.