GTX280... mmm nice card. Mostly a late 9000 series or GTX280 and above. I wouldnt recommend the 9000 series too much actually. I have had a fair few problems with them, and they dont offer much more performance than the 8000 series.
That is of course, if you have the budget. I had a 8800GT for ages, and I loved it. My card had a fan defect though :/ so I had to get rid of it
Please give us more specs on your Motherboard and PSU. As for the topic, don't go and spend a load of money on somat that you won't use that much. What games are you looking or aiming to play? What is your budget? I mean if a iwanted a normal everyday GPU i'd go for either the 8800 GT 1GB or the 9600GT