These are the three video cards I am looking at. However, I can't decide on one. PowerColor PCS+ AX7870 2GBD5-2DHPPV Radeon HD 7870... PowerColor PCS+ AX7870 2GBD5-2DHPPV ^ Chipset Chipset Manufacturer AMD GPURadeon HD 7870 GHz EditionCore Clock 1150MHz Stream Processors 1280 Stream Processors ^ Memory Effective Memory Clock1250MHz (5.0Gbps)Memory Size 2GB Memory Interface256-bit Memory TypeGDDR5. Or a Amd Radeon 7950 or Nvidia Geforce GTX660Ti? They are all close in performance and I'm looking for Best Bang for Buck. Please let me know, thanks.