If you want to go with a bigger tank than a paintball cylinder here is what I recommend, go to a Airgas location and get a tank and regulator, the regulator will be yours the tank will be exchanged every time you go which is very important as CO2 tanks need to be re-certified every so often until it can't be anymore.
Your tank will be filled up by professional which is also very important.
You can also buy a tank what you are looking for is a tank like this http://www.amazon.com/dp/B0088P10OO?tag=amzn-buynow-20
An air tank not and SHOULD not be used for CO2.
Personally I prefer exchanging my empty tank for a filled up one it makes more sense, it's just like you going to exchange a propane tank.
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