I have a few belts, some more expensive than others.
I picked up some sturdy 1&1/2" belts at Tractor Supply a few years back. They are thick, and rugged, but still not the best to hang a heavy gun on. I bought them a bit larger than I need, and use them for IWB carry where there isn't much stress on the belt. I think I paid $15-25 for each of them.
I also have a double-thick custom belt from K&D leather. Its fantastic and does a great job at keeping any OWB holsters from sagging over under the weight of the firearm. This had to be custom ordered and was a bit more expensive, though. I'd like to get another one, in black to match my brown, but haven't gotten around to it.
I prefer the 1-12" belts; they fit most pants, holster/gear, and offer great support. I stick with leather, as I like the look and it gets the job done.