I have had really good luck with Milt Sparks, one of my Milt Sparks belts is over 10 years old, still looks good, and is still plenty stiff enough for carry.
Originally I was very pleased with my Galco belt, but over time it just has not held up as well as Milt Sparks, and for the cost of a Galco one might as well go custom.
I also know people who use Kramer leather and are very pleased, FIST make good products also Mr. Murnack of FIST leather is a great guy.
I am going to purchase a Wilderness instructors belt. I will let you all know what I think.
http://thewilderness.com/