That's pretty broad, and varies greatly by person, and their chosen play style.
You're going to need a molle system of some kind, and mag pouches. Any pre built vest probably won't work for you. Check out http://rippleind.ca
if you're in Canada, I'm not sure if they ship to the US.
Personally, i'd recommend a molle plate carrier of some kind (not a fan of chest rigs or vests), with milsig fazmags (can get these from Milsig Direct) across the front to hold your mags. You can then buy a separate radio pouch to attach somewhere as well. As for the remote tank, I'm not sure what you can get to hold those as I run with air in stock.