Please suggest nvidia alternatives for an ati radeon hd 7850. I am choosing nvidia over amd because nvidia has better support like better drivers, some games customized for nvidia graphic cards, better technologies: Physx, FXAA, TXAA, etc. I have also heard many issues related to drivers for 7850. Budget is very tight so please suggest cards of equivalent or a little bit less performance for the same price.
My PC specs:
Coolermaster 550W Extreme power plus
1GB XFX Geforce 210
Windows 8 Pro 64-bit