Currently using an Asus Maximus Formula 7, why? Well my first big OCing board was a Maximus Formula 3, this board went through a good few builds including a bit by bit conversion to full water cooling (GPU, CPU, Motherboard) it lasted for five years, took a fair amount of abuse through the various builds and kept my old Core 2 OC'd without issue throughout the whole time. Until the Southbridge started to go tits up around a year and a half ago.
I wanted a new board that had the watercooling bits pre installed and the Formula 7 was one of the first boards Asus launched with the correct fitting (The Formula 6 had a pre installed water block but required a barb connector which I wasn't going to deal with.) The board has been rock solid stable pushing my watercooled 4690K at 4.8Ghz now since I finished the full loop around a year and a bit ago. Not only that but it looks damn fine as well.