Looking for Graphics and PSU

hi im currently building a mid range gaming desktop but i duno what graphics card and psu to use.

cpu-intel core 2 duo e7500 @ 2.97GHz

mobo-gigabyte ga-ep45t-ud3lr

ram-team elite ddr3-1333 2gb x 2

any gd recommandations? budget ard 300~400 max .

sapphire HD5770 vapor-x, 279 or 249 i think at pcthemes

$279 at pc themes