I've got to agree with Xaiver here- There have been a lot of improvements lately.
The DCT is among the biggest improvements out there. I've been using a few of them successfully for awhile, and there are also tanks for single-coil cartos out there as well. Prices range from $6-8 and up for the plastic ones up to $50+ for Glass or small-production-run units.
**Edit: I was unaware of the V1 version of the provari having a 2.5 amp switch. If you have the V1, I cannot recommend the DCT's unless you swap the dual coil carto out with an XL single coil. Thanks to TJ and his post below for pointing that out!**
Phiniac is the name-brand glass-tank maker. Smoktech makes the cheap DCT's that most people have been using.
For the cutting-edge, the Genesis-style tanks are just starting to be a mass-produced item. They can be expensive and hard-to-get (read: LONG waiting list/SHORT stock times). provape.com will be stocking the Z-atty Pro, which is a Genesis-style made to go with your Provari, and here is a message from their subforum:
"These will go on sale next week for $149.95. Estimated for Tuesday at 1pm pst. We will have a limited number of units available."
I would say conservatively that they will sell out within the hour that they are released, probably sooner.
The new DID clone is the most cost-effective and easiest way to get into Gen style systems. It is probably the first mass-produced unit of its kind. I would get on the list in the co-ops to get one at a great price (I paid $9.82 for mine a few days ago), or check out discountvapers for a reasonable price and less wait-time (they claim they will be in stock very soon @ $25).
The genesis systems have a learning curve, but tutorials are easy to find both here on the forums and on youtube.
Best of luck, Happy Vaping!! Congrats on your return- and Provari's are still one of the best units available, so you made a great choice there!