almost all the boards can overclock to that number..for the current platform the oc is mostly dependent on the chip..its batch number..etc...
Very good boards on the platform are the maximus iv extreme, Gigabyte p67a ud7 B3, P8P67 ws revolution, pro, and deluxe, and more... they are all good to some degree...
As for blocks..havent seen any yet.. check koolance and DD...but, i dont think they have any atm