I don't think 8600 GT is available in AGP variant. ~_~.
So I say go for 7900 GS AGP for about 9k. It's a good card, and should last you for a good while. If you absolutely need DX10 support, then you're going to have to get a new CPU and Mobo, sadly.
k.. thanks a lot everyone. I think i'll buy it from ITWares people. If you have any online transacting people like them please leave a note. i couldn't find any online shop which sell cheaper than them. as i live in a village i cant go to any shops and buy myself.
PS: One more thing guys, which 8600GT is the best now , can anybody tell?
i can go for Galaxy, ASUS, XFX and Sparkle. Which would be a better buy? i have heard that XFX is not having a component called HDCP(sorry if i am wrong). is there any other good brand other than the above mentioned available in india, if yes where? thanks in advance.