I too started on the V2s and intend to continue using them likely forever. Although I have graduated to a VAMO v5 -- which I adore -- It's only practical (and wise) to use when I am at home or sitting around bull....ting with friends at one of our homes. The size of the device and the VG liquid I like to smoke through it is just too conspicuous (and to some obnoxious) to use just anywhere.
At work, while at a bar, or in just general out and about, I use my V2s with a PG liquid. Their small size plus the light vapor that PG liquid creates is perfect for blending in and inconspicuous use. As I type this right now, I am sitting in a government computer lab, on site, with a V2 right in front of me. People around me are making as big deal of it as I am that I am smoking one.
This all said though, don't throw out your V2s just yet. Consider that some devices and liquids are more suitable for certain situations than are others.
As far as your question goes regarding which APV to get, I think that either will do you just fine. In the end, they all do the same thing, which is to provide power to an atomizer. That's it.
The distinguishing factors are quality and cost, between which there is a proportional relationship. The Provari will last you longer, but will cost you more. Outside of that, there is aesthetics, but for the most part, there is no right-or-wrong answer independent of independent circumstances.