You should get the full gamut of overclocking options, including voltage tweaking, with a Z77 board. What make a board a good or bad overclocker is probably how good the BIOS is at letting you tweak ...
I've got a rig that's a few months old. It's got a i7-4770K w/Corsair H60 and a ASRock Z87E-ITX motherboard. For some reason, I can't overclock past 4.2GHz. I've toggled all the motherboard settings ...