EPoX. They routinely produce great motherboards that are less expensive than their competitors.

I've had great luck with ECS, and while not everyone has, they're finally getting their feet wet in the enthusiast market with their KN1 Extreme.

Abit has kind of fallen off, at least in the AMD realm, since the NF7-S for the Socket A processors. I'd very much say that DFI has taken Abit's placing atop the enthusiast based markets.

I've had two ASUS boards, hated both of them. Bought a Gigabyte board to replace one of the ASUS boards, the Gigabyte board was marginally better, but it wasn't anything spectaular.