Upgrade card for FS 9

Hi,I'm making a couple of minor upgrades to my Dell 8300 3 ghz machine to help run FS 9 a bit better before the release of DX 10/Vista. I'll fool around with FSX but am not expecting great performance but get pretty good FS 9 performance as is. So, I'm adding another gig of RAM and have networked ActiveSky to another machine via WideFS. I would like to upgrade my ATI 9800 XT card but the Dell only has a 305W power supply so I'm confused as to what candidate cards are out there that will work with my existing system. I don't want to get into changing out the power supply.Some of the later generation cards don't seem to perform much better than the 9800 in the benchmarks. I would appreciate any suggestions from you good people.ThanksJeb