If I were you, I would save my money and get a nice Kayfun or other quality topper instead of paying top dollar for a mod.
You can't go wrong with a ProVari, but there is sometimes this lore surrounding the ProVari that would make you think that a ProVari (or any US made mod for that matter) is made with Unicorn tears and provide you with a transcendental experience, while anything from china is nothing but crap. This is the furthest from the truth.
Let's not lie. The ProVari is a VERY well built and VERY accurate voltage delivery system. AND China has produced it's fair share of crap (Can you say KSD KMAX???!!!??)
BUT....If you blow your budget on a ProVari and a Kanger Protank2, I can guarantee that you won't get near the quality vape that I am getting with a quality Kayfun Clone on a Sigelei V3 at 1/3 the price.
I am NOT suggesting you do not get a ProVari.
What I am suggesting, is when you upgrade, upgrade equally. Your vape experience is only as strong as your weakest link. I'm not putting a Kayfun on an Ego Twist. I'm not putting an CE4 on a ProVari. If you have the funds to get a ProVari and the necessary other items to really rock that ProVari, then go for it.
However, if you don't have the funds, I think you'll find better options by getting something like a high quality Kayfun clone on a nice middle of the road mod like a Vamo, SID, MVP or Sigelei.