I use the Comp-Tac Kydex reinforced belt and it is a big step up from the best belts I could find in any belt store in central florida that I looked at, and I looked at quite a few stores. I have no idea how good your current belt is, but I assume if your belt is the same thickness as the Comp-Tac it would be similar in function. The kydex helps the belt maintain form everywhere except near the buckle. Kydex is kept away from the buckle because the adjustment holes would create stress concentrations and the kydex would snap after awhile.
With a heavy-enough gun (all steel 1911 w/rail, 47oz loaded) and enough sweat (central florida summer heat+humidity), the Comp-Tac still stretches more than I like. I plan on eventually replacing the comp-tac with a non-leather belt like the Wilderness Instructor belt. I personally plan on never using leather again, it just stretches too much if I'm outdoors at all in the middle of the summer. If your handgun is in the 30-35oz (loaded) weight range then you don't see much leather stretch.