LGA1155 socket. It's a bit more complicated, too, because of chipsets.
For an Ivy Bridge CPU like the i5-3570K, Z77 boards are going to work out of box, but for P67 and Z68 chipsets you are going to have to do research to see if the specific board works out of box, certain ones do and certain ones don't, so then you need to check to see what you need to do to make it work (use a sandy bridge cpu to flash the bios, buy a bios replacement chip, buy the board used from someone who has the latest, ivy bridge compatible bios on it, etc).
Given your post though I think this might be beyond your capabilities and to keep the answer simple, Z77 chipset, socket LGA1155.
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