Provari is rediculouse priced.
Not really.
Now that's an expensive e-cig.
Seriously, it really depends what you are looking for.
I would recommend the iStick honestly. It has a built in battery, so you don't need to buy any other batteries and charger like you would if you went for a tube APV like a Vamo or a box mod like an IPV.
It's also inexpensive, has a small form factor (tiny in fact), can last over a day of vaping and are wildly popular at the moment - for all those reasons I mentioned.
I know when I am looking to buy, I do a ton of research as there are hundreds of different devices out there, and new ones coming to market all the time. I suggest you do the same. What works for me (or other forum members) might not work for you.
I would recommend looking around, seeing something you like the look of, then looking for reviews here on the forum / you tube to see the pros and cons of it.
Good resource is right here on ECF on the
http://www.e-cigarette-forum.com/forum/variable-voltage-apv-discussion/ <--- have a look around, click through some threads and see what people are saying about their favorite APV. Might give you some ideas you'd not considered.