I've been using Asus exclusively for a while now. I would build a PC for a loved one with a Asus with out a doubt.
Lately, I've tried a Gigabyte P35-DS3L and so far, so good.
Cheers!
I have a E6600 on a Asus P5B-E in a Antec P-180. Its covered by a Scythe Infinity.
It runs between 44-48C all the time. I think the fan/heat-sink might not be installed properly.