B75, H67, H77, P68, holy shit. No idea. Using an i3-3220 CPU. NO need for a chipset that eases overclocking. Need help with this soon, thanks.
Depends on the features used (SSD caching, PCI-e lanes, USB3, etc). If you don't use any special features, the simple answer is: whichever is cheapest.
Musts: PCIe 3, USB 3.0 (Rear I/O and Header)
Probably a B75 motherboard will be your best bet. PCI-e 3 is dependant on CPU, which you have covered with IB Core i3, and even the cheapest B75 mobo I've seen sports USB 3 (rear and internal header).
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157362
One last thing, what's the difference between all of these chipsets?
Various features, such as SSD caching, PCI-e lanes, number of SATA ports, and other not-so-obvious technologies. I honestly don't know the exact differences, but you can look at them here:
http://ark.intel.com/compare/52807,64018,52816,64021,64024,64030
I have a headache now. Haha