I will jump in with my two cents
Asus - Board of choice and have had consistant great luck with them before the P67 dibacle, their WS board with voltage locked at 1.53 is unaceptable. Now up in the air on a P67 board but if it is to be Asus it will be a M4E .....
MSI - Have had two, both sucked, not only overclocking but just seemed chinsy and both ultimantly failed
EVGA - Have had two as well, both x58 the 758 is underwelming but solid water board
The 760, what can I say, just a great all around preformer
Gigabrite - Have had a few, all underwhelming other the the x58 Extreme to spite being locked down at 222 BCLK is easily the best ambient air and water board I have ever owned, the rest of them at best mediocrity ...
Abit - Back in the day ..... they were teh bomb .... Loved the early AMD boards and used many of them... What the hell happened ???
Foxconn - never owner one but was tempted by the Bloodrage