Is this (http://www.frozencpu.com/products/5324/ex-rad-107/Black_Ice_GTX_Xtreme_120_Radiator_-_Black.html#blank) enough to watercool a i5 3570K (overclocked) and a GTX 670?
No one said you can't but you might have to remove some HDD cages to get a radiator in the front as well as fitting one to the top.
Hmmmmm, how about this layout. Pump/reservoir, 240 MM radiator at top, CPU block, 120 MM radiator mounted at the back, then to my graphics, back to my pump/reservoir.