I'll just throw this out here since you didn't say how much you are willing to spend and see if it interests you. It's NOT inexpensive, but IS very nice...and probably the safest, non-fiddley mod made.
Last Mod you'd ever have to buy. Have a look...
It's a new Hybrid called Zenesis. It comes in a Standard size AW IMR 18650 battery and has an INTEGRATED TANK AND A REBUILDABLE ATOMIZER. All you do, once a month (or so..YMMV) is change the stainless steel mesh wick and wrap a new coil...which are provided with the Zenesis, a year's supply! No more cartos. No more atomizers. All you do for one month is fill the 5 ml tank and change the battery. It also comes in a Zenesis mini with a 4ml tank and atty integrated and uses a 3.7v 18350 AW IMR battery.
The way you wrap the coils (2-3-4 wraps) determines the vape and the adjustable Throat Hit makes this PV pretty much a vv. They are made in the USA of surgical stainless steel, machined in Chicago and hand assembled by zen~, the owner. Here's his thread that explains it all:
http://www.e-cigarette-forum.com/fo...rids-featuring-zenesis-pv-46.html#post5179269
Here's zen~'s web site:
Home
The next batch is due to be released in March (maybe April by now), if you can wait that long. He also makes Hybrid atomizers! z-atty-u (universal), z-atty-pro (for the Provari) and z-atty-g (for the GG). All the z-atties have a 4ml tank. Rebuildable, just like the Zenesis Mod atomizers.