video card

hi all tell me what video card is best to buy for Intel Core i5-3570 3,4 GHz(Twin to 3,8 GHz 6Mb 2xDDR3-1333 HDGraphics2500 TDP-77w LGA1155 OEM . Windows 7 64 bit PSU Corsair CX 750W (80+Bronze, ATX v2.3, Active PFC, 120mm Fan,Ret.) [CP-9020015-EU] . The amount of memory installed 8GB from 25 to 27 Tr