That PSU should be fine as long as you don't overclock your CPU or GPU a whole lot.
As for the radiator orientation - I would put it at the back of the case and put the exhaust fan at the top.
OK awesome, because I was reading about the clock speeds for the
EVGA GTX 670 FTW, which requires 500W or greater. It has:
1006MHz clock (1084MHz boost), 6208MHz Memory speed
whereas the gigabyte one I ordered (550W requirement) has:
980MHz clock (1058MHz boost), 6008MHz memory speed.
going off those stats surely I can overclock the gigabyte slightly to those speeds without too much trouble?
I've got a non-K i7 so I won't be overclocking the cpu at all.