graphics

I am not going to buy a processor and a mother board with very high configuration which are not affordable for me.Currently i am using AMD Athelon 64 and K8S-Mx motherboard with sis chipset also with external graphics card with Nvidia 4000Mx processor.I wish to upgrade my computer for latest games.But Nvidia 8800 is not affordable for me at all.So i prefer Nvidia 8500 which is available from 70$ to a maximum of 90$ with Dx10 and with a memory of 256/512 MB also it has 7.0x performance

yes i wanna buy a ati HD3850 to play UT and crysis