I think you already sold your self on Gigabyte Blue, and that's not bad. I do not have a lot of experience with Overclocking them. I do have a 754 at 2.55 which is OK and seemed easy to do and I might have gone further if I had better cooling for long term, but I keep it at the same clock 24/7.
I do have more experience with Abit's Bios interface and think it to be the best Bios interface period. ASUS is convoluted at times I think and I have one for my main rig, good board, weak sister Bios.
Still I would not go for Bios alone, Gigabyte has some quality, and I had occasion to test the customer support and it was very good compared to most that are very crappy, ASUS included.
GPU's, 3870, 5770, 7970 and a pot load of older cards.
CPUs, 1 6400+, FX 4170, FX 8350 and more older ones.
Mainboards, ABIT, ASRock, Asus, DFI, EPoX, Gigabyte, MSI.