You are carrying a heavy gun and need a good belt. Trust me, a cheap belt isn't going to hold up nearly as well as a well made one. You can buy several cheap belts or just buy one good belt and save money in the long run.
The Beltman makes great belts and are well worth the money. If you can afford it and need to save up a bit, I'd suggest you go that route.
All you need is double layer belt. Mine is horsehide and even after 4 years of use, it is still as stiff as the day it was new.