i think i misunderstood you budget . .so i picked lesser card. the 6870 is better than the 560ti (i think)
the asrock H77 has more features . .btw, if it gets tight with money; i found a superflower PSU that is good quality like the XFX; up in my last post.
the 750 is too much; the i3 2120 will never go over 65 watts (mine doesn't hit 40 watts when stress testing) the chipset on the motherboard is 7 watts and each stick of RAM is 8 watts. then add 10 watts for the hard drive when it first spins up and the same for the optical when in use.
65+7+16+20=108 watts when everything is loaded (which never happens at the same time) add a 200 watt graphics card and a 520 watt PSU can easily handle a 308 load.
what is also important and often overlooked is the idle wattage because a PSU efficiency takes a nosedive under 20% load. the system so far would more likely idle ~ 104 watts for the 520 than 150 watts for a 750 watt PSU.
no no thank you for all this. Than the Antec HCG 520 is ok
the rest of the build is ok ?
if you are getting
ASUS B75 B75 So.1155 Pro3-M Intel Dual Channel DDR3 mATX
G.Skill 4GB DDR3-1600 DIMM RipjawsX CL9 Dual Kit
Cooler Master 690 II Advanced Full Black Mid Tower USB 3.0 without PSU Black
S1155 Core i3-2120 BOX 2x3, 30 GHz 3MB L3 2x256KB
520W Antec High Current Gamer ATX2.3
and any graphics card (7770/6850 or above) is good.