advice please

depends, do you game or do anything graphics intensive?

if you can wait. get the gt300 it comes out this fall/winter

i was thinking in the xfx 4870
http://www.compusa.com/applications/...007&CatId=3669

Do you play games a lot, and are they newer games? If they are depending on what game you play a 4870 would be a good price per performance.

Is see that your monitor is only 17"... With low res i guess your overclocked 9800gt can still handle all new games in very high settings except crysis. So i'd hold out til the new cards come is i were you, but if you can't the 4870 is a pretty good upgrade.

8800GT is already overkill for your monitor. if you got money to burn, go buy a larger display instead and wait for new cards to come out that are right around the corner.