If you want a quality rig, you can pay one of several companies a great deal of money to make you one. Or you can save yourself 30-50% my creating it yourself via Evilbay parts, if you're willing to sacrifice a warranty and customer service.
You live in Hawaii, and therefore, financially speaking, paintball is not an option (not kidding - ask your Hawaii forum-mates if you don't believe me). If you plan on spending more than the next 2 years with a CO2-injected tank, a 20lb cylinder is your only real bet (again, check with your state forum). If you are determined to go paintball, you can buy a $15 paintball adapter from one of several sources. This will allow you to run any regulator rig you'd like with a painball tank.
Regardless, post this stuff in the Hawaii forum. You guys are separated enough from the rest of the states that finances are significantly different. And good luck!