You have some great options as to where to get your gear!
in NO particular order, and I say that honestly!
Double Tap Shooting Supplies - These guys love the ghost line, and will go above and beyond to make sure your rig is perfect for what you need,
Fast Toys Shooting Sports, Phil is freaking awesome, knows his stuff and pretty sure IPSC is required for him to breathe.
Freedom Ventures is Tangfolio central as far as I know. Really great service, and a go to for parts and new shiny things!
CRAFM is the only one that I have not dealt with yet, but have not ever heard anything bad about them, besides their site being in french by default, lol JK
I love the DAA belt, but see alot of CR speed belts on the field also.
For Mag pouches, I love the DAA line, but if it wasn't for a bonus on the paycheck that week, I would have went with the ghost 360, both great options, but the DAA Aluminum's just really caught my eye.
I am sure there are other great vendors out there, I just do mainly online shopping, and being site sponsors they usually get my money first.
My best advice from personal experience getting into IPSC last year:
Buy once, cry once. Check out different gears to see what fits you best, and don't try and cut corners. I am a cheap SOB but after my first match, had to spend an extra 200 upgrading things I had cheaped out on originally. I regret using the crap gear I did for my black badge course, as it was a bit of a distraction as opposed to stuff that would have just worked smoother.
A good place to ask this would also be on the Action Shooting Games forum, Good luck!