You have already a good board, with two pcie 3.0 slots and SLI support, no point in getting another one, if it is for a 3-way sli or 4-way sli, those mobos will cost a lot more than that, like in the price range of 260-360$.
Any decent z77 motherboard will allow to oc the cpu to certain limits, it all depends on what cooler you have for the cpu.