gaming pc build suggestions

can any one suggest me over the following configurations for assembled pc

i5 2500K or I5 3570K ..

gigabyte GTX 660 or HIS HD 7870..

mother board ASROCK Z77 EXTREME 4 (if any i would like to here from you,suggest me regarding this i dont know much about this)..

smps 750W or can i decrease that and which company to choose

suggestions over cabinet

1tb segate barracuda

4*2GB corsair vengeance

212 evo cpu cooler

dvd writer LG

monitor (1080*1920)with necessary ports

if i dont OC or CROSSFIRE then suggest me where can i decrease my expenditure.