You might consider an Altoids or Penguin tin VV mod made by a modder named Caged and sold by SmartVapes.
For $60 (shipped), you get the best switching regulator on the market (a 6-amp OKR/t6-w12), an internal voltage display, dual 18650 ICR battery life, and a metal box with very solid interior construction. Voltage regulation is as rock-solid as on a ProVari, with even more power and higher voltage if you want it. The only drawbacks (in my opinion) are that these mods are fairly large (3.75" x 2.3" x .8") and not usually in stock (they appear a couple at a time and get snapped up pretty fast---get on SmartVapes email list for notification when they come in). I own the Penguin tin version and consider it one of my
best PVs, right up there with my ProVari, Vmax, BuzzPro/iPro, etc.
Link:
Altoids Penguin tin VV Mod at SmartVapes
For about the same price, SmokTek sells a smaller form factor 3AA-size plastic box that uses the identical 6-amp regulator and dual 14500s (but without a voltage display). Both are great choices.
Link:
SmokTek VV "the beast"
As an aside, I have two Kicks---one in an Omega (using an 18500 IMR), and another in a non-extended Bolt (using an 18350 IMR). Both perform beautifully at their full tilt setting of 10 watts, which is as much power as I personally need. I also have a red Acrylimax VW on the way from Madvapes, but I can't offer an opinion about that yet.