^^ good suggestion & nice explanation bro.
For gpu I would recomend 2x HD 4770 which will cost Rs. 14K & is neck to neck in performance compared to GTX 280
( for this get 750W PSU )
or get 2x zotac or palit gtx 260 & run them in sli. they will cost you Rs. 20-23K & will perform better than GTX 280
( for this get atleast a 1000W or 1100W psu )
May I add one point : it's not that UD5 is not a OC board. It's suitable for mild to mid range OC. But evga x58 mobo is suitable for mid to high end OC.