Nvidia has a bad tendency of renaming cards and this one is just the perfect example. 9800gt is renamed version of 8800gt with not much new to offer other than some power savings. I had this one before I shifted to 9800gtx. 9800gt is a good card with nice features. Though it has grown old now but is still a very good choice for mid range to mid high range gamers. You can run games like Prince of Persia, Company of Heroes and Call of Duty with almost highest configuration. But people wishing to play games like STALKER or Crysis then you better look for a costlier card.
Power requirement is not very high and you can rum this with a standard 450W power supply with one HD and one CD drive. Not much heat problem but the fan makes a lot of noise. There are passively cooled versions also available though. The price of the card is not very high.
EVGA has a very nice package with assured performance and tangible overclocking capability.