Under $100 APV's, I like the Sigelei V3/V5. Great quality, telescoping, very nice and reasonable. A lot in that package.If you are interested in high-end devices, then that is one of the smartest things you can do. The Provari is a fabulous device and certainly top end. Few other APV's can compete at that level. Get the mini. You can add extension easily later, often blinging out the Provari. For toppers, I like:
Clearos:
1. Nautilus
2. Aerotank
3. Protank
Carto Tank:
1. IBTanked
2. Phiniac
3. GP Snp
RTA's:
1. Kayfun (3.1 or Lite Plus)
2. Taifun GP
3. one of the above
I evolved from clearos to cartos to RTA's. I'm exclusively using RTA's and an occasional RBA (Origin or Taifun Dripper). Love the path and evolution I took. If I had to do it all over again, I would buy a Provari and Kayfun day one, learn to rebuild by watching YouTube tutorials, buys some 28/29 gauge kanthal and cotton wicking and DIY my juice (which I did do day one). My vape is excellent and very hard to improve, but I continue to pursue. Very, very happy in Vapeland these days. Good luck, power up and vape on!