Welcome Jenny
There are so many choices out here right now (I've only been at this for about a year, and what's come to market has been CRAZY. I basically started with Spinners, but have moved to a little more "advanced" devices. I used MVPs and VV3s through the spring and summer (with basically the equivalent of the mini protank) I got a couple larger tube mods September/October and threw in a couple Nautiluses (full and mini) I REALLY do like the Nautiluses (when I prep them correctly)
I just try to boil it down to some basic tenants - 1) Form Factor - Stick/Tube/Box 2) Battery Life - how long can I go between charges? 3) Replaceable or non-replaceable batteries - Spinner/MVPs are non-replaceable batteries. When they die, they die. My tube mods (Sigelei Zmax V3 and Vamo V6) and my iPV Mini all use replaceable batteries, so I need a separate charger. 4) Power capabilities - The MVP2 tops at 11W power output. The MVP20W and the MVP V3 offer higher ranges, for which some toppers work much better - like the Nautilus.
Tanks - do you want to learn to rebuild? If not, you'll need to stick with something that offers replaceable coils (Nautilus, Kanger Aerotank, Kanger SubOhm, and a plethora of others.) More vapor? What PG/VG level are you currently using? I've been finding that the airflow was a little restrictive on the Mini ProTank. I also have been rebuilding those coils, and I find I get much better results (with basically the same juice) with my coils than with the stock coils.
So, yeah, there are a LOT of options out there. Depending on your budget, you could come up with a couple of different toppers and a really decent mod with which you could grow a bit, and not spend $100.