AWS I believe is well-regarded for belts.
My go-to for a lot of soft gear has been Direct Action, I got the big padded belt-and-suspenders to make a modernish LBE, but that's probably not what you're looking for. They should have some lower-key options as well though.
Raptor Tactical also has a few belts that look good that have interested me.
If you're going to use multiple pistols, set your belt and holsters up for a modular system like the Gcode RTI or Safariland QLS. There's proponents and detractors for both.