Here are a few tier 1 class b boards. Actually the gaming 5 and ud5h are tier 1 class b, the ud3h bk is a tier 2 class a same as Archaic mentioned in a similar price range but with a 5yr warranty. Prices are a bit better as well as the quality.
http://pcpartpicker.com/parts/compare/gigabyte-motherboard-gaz97xgaming5%2Cgigabyte-motherboard-gaz97xud3hbk%2Cgigabyte-motherboard-gaz97xud5h/