You didn't state a budget, but here goes anyway. Have listed only Asus motherboards as they're amongst the best for overclocking. Also checkout similar boards (by chipset) made by Evga, Abit, Gigabyte & MSI.
Asus Striker Extreme click here (680i SLI chipset) | Reviews click here & click here
ASUS P5N-D click here (750i SLI chipset) | Reviews hclick here & click here
Asus P5N-E SLI click here (650i SLI chipset) | Reviews click here & click here
If you don't require SLI, there are some very good OC'ing motherboards with Intel chipsets like the P35 & P45. G