Gigabyte - Rock solid, (nice looking), reasonable overclockers IF you have the 'pro' version of a certain model. For all those whom say "their aren't enough tweaking options", press CTRL + F1 in the BIOS to unlock everything (Voltages, RAM timings, etc.).
So far I've used 3 Gigabyte mobos, no problems with any of 'em. Then again, I have never experienced the 'high end' (DFI, and such) of MOBO's, so I may be missing a lot.
AMD 64 X2 4200+ @ 2.2ghz
2048mb Corsair PC3200 RAM (2x1gb)
WinFast NF4SK8AA Motherboard
660GB HDD Capacity (3xHDD)
600w Enermax PSU
eVga 8800 GTS 320mb