If you like the Nvidia brand the modern equivlent of the 9800 is the gts450 or the newer gts550. Anything less thant a 450 would most likely be a down grade.http://www.newegg.com/Product/Product.aspx?Item=N82E16814127605
The 450 is like 110 and the 550 is around 130.
The AMD HD6770 is around $100 has lower electrical usage and is a bit more powerful in terms of gamming performance. I would recomend a 6770.
PS the 9800gt is a PCI-E card. Leaving off the e confused the first poster.