I think it comes down to budget, if the ProVari is within what you feel comfortable spending, then I would go that route. However if the ProVari is going to break you, or just don't feel comfortable with spending that much, Sigelei Zmax mini can be had for around $50, at least that is the range I paid for mine from Exhale Vapor.
If you are considering a ProVari, I would say the odds are that you will get one, either now or later. ProVape will still be around if you decide to wait. And if you do get the Sigelei Zmax mini, it will make a nice backup to the ProVari when you get one later.
Best to you, and let us know what you decide, there are a lot of decent APV's, and a few really great ones.