HPA for Phantom -- tank suggestions?

[Doc]

Hey guys, so I made the mistake of trying to use 12grams and my 3.5oz in 30 degree weather the other day -- NOT COOL! 

So it convinced me that I ought to invest in an HPA tank for the Phantom. I have a remote already so that part is taken care of. The only thing is -- I have never run HPA on any gun and don't know anything about it. Could someone give me some advice for what tanks work best on a Phantom?

[Fred]

Any tank that isn't a low pressure output will work fine.

[WoodsBaller57]

I use a 13 Cu In HPA Tank on my bottom line setup. It is a high pressure reg so it has basically the same output as a CO2. 200+ shots per tank fill.
The tank helps balance the feel of the marker and in some respects works kind of like a stock to help line up shots