顯示卡壞了,有咩推介?

最近張卡壞壞地,想換過張,睇下大家有咩介紹?
Budget: Max~HK$1500

CPU
Intel Core i5-3450 Ivy Bridge (3.1G, 6M Cache, LGA 1155,77W, with HD2500 Graphics)
MB
ASRock B75M B75,DDR3,LGA 1155,USB3.0,SATA3 6Gb/s,M.ATX
RAM
2* Kingston DDR-3 1333MHz 4G Ram KVR1333D3N9/4G

原本果張卡
Sapphire HD7770 Ghz Edition

依家見到依幾張,邊張相對抵?
960如果買4gb,超左預算,所以想睇下邊張性價比高..同邊個牌子相對好..

Thanks

1. MSI GTX 960 GAMING 2GB $1609
2 ASUS TURBO-GTX960-OC-2GD5 $1590
3. SAPPhiRE R9-270 2GB DDR5 $1220
4. GIGABYTE GV-N75TD5-2GI $1179
5. ASUS GTX750TI-PH-2GD5 $1090