I'd look hard at the following:
A few Vivi Nova 3.5ml version 2.5 tank/atomizers. They work great, although there's a very long thread about how to tweak them. Mine have been stellar right out of the box, and they each (for $14 a pop) come with three separate atomizers - 1.8, 2.4, and 2.8 ohms, any of which your Provari can power beautifully. I'm truly psyched that mine aren't working as well as they can, because I love them. After one month of very good service, I finally installed a second atomizer. Take that, cartomizers.
The Odysseus from GG; the "big brother" of the Penelope, as I understand it. Get one. Just get one.
The Bulli A2-TM atomizer, in stainless, with 510 threads obviously. Awesome, from everything I hear. There's a huge thread here as well on their care, feeding, and tweaking.
The i-Atty. I recommend it on hearsay alone; but damn good hearsay. Look for GeekVaperGirl's review on the YouTube. She's good.
That should hold you for a while.
***
Afterthought: If the ProVari is your only APV/power unit, I recommend that you also get the vastly inferior but insanely convenient Joyetch eGo-C Twist; from one to three of them. They're $22 or so each, and come in blacl, chrome, blue, white, pink, green, and maybe a few other colors.
This review sums up why I recommend that you get a Twist or Twists, in addition to your (superb, magnificent) Provari:
THE EGO TWIST IS A GAME CHANGER - YouTube Grimm Green Twist Game changer
Another very favorable review from PBusardo:
A PBusardo Review - eGo Twist - OvaleUSA - YouTube Phil Busardo Twist review
Happy vaping!
