Well i hv been using the nVIDIA Ge Force FX 5200 (256 MB DDR RAM) graphics card since a year now and till now i hv been able to play all games like NFS-U2,DOOM3 and many more..
Well all u guys here will be right abt the fact that the FX 5200 is not a powerful card but Mr. Anujpant,
if ur budget is really tight and since u mentiond that ur a casual gamer,u can go for the FX 5200 version of AGP card..well yes other ppl will hv different views but since ur post is abt the FX 5200 and also that i hv been using it since 1-year..(without any glitches/problems) and the problem of compatibility for many games is also not present..as this card is compatible for many games.....u can go for this card as well
Neways the final decision is always urs man !!!
cheers n e-peace....