The H77 cannot overclock and cannot Crossfire.
The Z77 can do both.
The i5-3570K is an unlocked CPU made for overclocking. If you're not going to OC anyway, you're better off with cheaper CPUs that have locked multipliers.
In this case, they would be the i5-3450 and i5-3470.
the motherboard will be your bottleneck its old and outdated you want a well balanced system not just powerful in one area.
The H77 isn't old nor outdated....
It's currently the best motherboard you can get if you aren't overclocking and SLI/CF-ing, as far as I know.