Once you learn the game, you can just about tell what division someone is shooting just by looking at them wearing their rig.
I agree that going out and buying a $125 safariland race holster now because you think you might want to shoot Limited Division is putting the cart before the horse.
Take whatever you have, go to the match and shoot. Learn the game and decide what you like. I shoot Production Division mostly in USPSA, which requires "normal" guns and holsters that you could wear to carry.
You're not going to pick the "perfect rig" and you aren't going to go shoot the perfect match first time. Just go have fun, be safe, and maybe learn something.