1.5gb 580 sli let alone the 1.28gb sli will suffer from vram shortage across 3 screens at some stage, you'd want the 3gb 580 and 2.5gb 570 to avoid. or better just go 6950/6970/6990
btw you'll need a cpu cooler if you plan to pust the i2500k past 4ghz as the intel stock cooler wouldn't handle it, the vengence ram will limit the coolers you can use if going air cooling.
Will probably add the new venom voodoo cpu cooler and change the ram.
