A good part of comfort is more than sheer weight of the gun. I really like this holster:
http://www.montanaholster.com/It's not fancy, but sturdy and carries beautifully. I find that I don't even use the belt snap, just let it hang, so to speak. Also, the shoulder rig is usable with other belt-style holsters (I use mine mostly with an old Bianchi flap holster holding a Model 57 S&W). Much more comfortable than either a belt or a typical shoulder holster. I can carry an N frame Smith and Wesson all day with no fatigue (at least from the gun and holster!).
