im looking 2 buy a graphic card. 1) Sapphire AMD/ATI HD 7970 DDR5 Vapor-X 3 GB 3 GB GDDR5 Graphics Card. for Rs.23324(1390 AED) (dubai) 2) Gigabyte AMD/ATI GV-R797OC-3GD 3 GB GDDR5 Graphics Card Rs. 27915 (in india) so which is the best graphic card for me. also 1 question im currently using biostar a780lb motherboard. this can support this graphic cards ?? also which psu should i get...as currently i dont hav good psu...im looking fir cheaper Corsair VS550 550 ...is it good buy ?