I'd start out with a reasonably affordable yet high quality
tank from IBTanked.
IBTanked - Get Tanked With Us!
As you can see from the photos included, the 19mm diameter looks very attractive on a Provari. You will have a choice of
tank length, depending upon the length cartomizer you wish to use in the
tank. More vendors offer the XL length cartomizers that are pre-punched than the standard length.

Length comparison of the XL and standard 19mm diameter tanks on Provari's. How to match carto length to tank length.
If you click the link under my avatar, I have several articles in my blog on topics like setting up a cartotank, a review of the IBTanked cartotanks, list of vendors that sell pre-punched cartomizers, and others.


