One other thing you'll get from a quality belt is COMFORT. A good belt will distribute the weight of the pistol almost all the way around your waist, as opposed to pulling down one side or the other of your pants. Plus, as the pistol shifts around on a non-rigid belt, it will dig into various parts of your waistline, with painful results.
I use a Galco belt, it's my everyday belt even when I'm not carrying. My only problem with it is I got the Havanna brown belt, it's almost too light to go with any of my dress clothes. In retrospect, I should have bought a black or russet brown belt, it would have matched my wardrobe better.
Galcos also come in at a decent price (about $70-$80 on the Internet) compared to some of the higher end stuff like Milt Sparks, Kramer Leather, etc.