I forgot you said these were just informal matches. 3 mags will probably be enough. I doubt they will have any stages needing more rounds.
Go with your selected pouch. You can always just flip the flaps over and tuck them in your belt or behind the mags. If you decide you like it, you can upgrade your gear later.
Go have fun. I think you'll find it's a lot more fun than just punching paper.
That was pretty much my thought exactly.
I prefer Comp Tac:
You can get some pretty cool holsters, or you can go plain and spend a little less money.
I have used them for USPSA, IDPA and 3 gun and they are great. You can adjust the retention with an allen wrench, and the kydex is very durable and well formed to your specific firearm. You can also adjust the cant of the holster and get a paddle or a belt attachment (or both).
I'll take a look at that, but I already ordered the fobus. Maybe for the future though. Thanks.