Hi, no actually I don't need the extras. The prices are the 137 USD - LK, and 116 USD- LX.
Then get the cheapest. The DisplayPort and SLI support on the LK are its key advantages.
However, neither is 'ideal' for overclocking. For overclocking I'd look at the ASUS P8Z77-V, ASUS Sabertooth Z77, or the cheap & budget ASRock Z77 Extreme4.