I recently began to assemble a bench containing the following components:
Asus Maximus IV Extreme-Z
Intel i5 2500K
EVGA 560 ti Classified Ultra (X2 SLI)
Corsair Dominator GT 8GB
As well as a single MCP655 VSPD pump (5 SPD)
The skinny of it is, would I be able to squeeze by using the AX750 for the before mentioned build or would a higher wattage be advisable?
You'll be absolutely fine with that power supply.
I too used to run two GTX 470s on a TX750W