I'm leaning towards this cuz I'm fed up with GB - warranty means they still charge you for rma'ing a good board. ASUS I've used many times over the years. Good STABLE BIOS. GB is in love with beta bios'es.
Of the boards you listed, both the ASUS and Gigabyte boards are tops for overclocking and should provide you with the best opportunity to hit your goal. I would slightly favor the ASUS P6T Deluxe V2. You should be able to find plenty of overstocking guides for this board through Google. Good luck.