Hello friends I'm building my budget PC. After lots of research I found AMD Radeon HD 7770 (1GB) Series is good entry level GPU for budget gaming PC. But there lots of GPU's in this series like Saphire HD 7770, XFX Radeon HD 7770, Model with 1 fan, Model with 2 fan, Ghz Edition, Core Edition etc. I'm little bit confused here please help me, which one should I buy. I wanna save as much money as I can with better performance.