Since ur budget is extending to 55k anyways i wud suggest go with core i5 rig sacrificing a little on cabinet.

Cpu - Intel core i5-750 (2.66Ghz) - 10.2k
Mobo - GA-P55M-UD2 - 6.5k
Ram - Transcend 2*2gb 1333mhz ddr3 - 5k
HDD - Seagate 500gb - 2.2k
Optical drive - Samsung/LG DVD writer - 1k
Monitor - Benq 22" G2200 HD - 8k
Graphics card - ATI HD 5850 1gb GDDR5 - 17k
Cabinet - Cooler Master Elite 334 - 2.1k
SMPS - Corsair VX 550 - 5.1k / GlacialPower 650W - 4.6k
Total - 56.5k/56k

It wud be wise even if you spend 6.5k more.

Core i5 is much better than any amd rig though it costs more , spending on it will ensure peace of mind and will be futureproof