There are so many mods out, that would be a task and a half lol. However, I will say that if you want a tube mod (like the Provari) your options will be very limited in a regulated mod. On the other hand, if you are OK with a "box" style, your options will be many and varied, to say the least.
One alternative to a tube mod would be the Joyetech Elitar Pipe mod (LOVE IT). Before you say "I don't want a pipe", hear me out....
You don't have to hold it like a pipe. In fact, it's more comfortable to hold it more like a tube mod by holding the "bowl" in your fist (sort of how tube mech mod users hold their mod, except much more comfortable since the fire button isn't at the bottom). That's how I vape it most of the time anymore. Bowl in hand, press button with thumb...or turn around and press button with index finger. There are many ways to hold it, though. Hold int it like a traditional pipe is actually the least comfortable way to use it LOL.
There are many places you can buy it, here's a start
http://vapespider.com/?s=elitar
The down side to the Elitar is that the stock tank is very small. I think it only holds 2ml of juice. However, it will fit any 22mm diameter tank with larger juice capacity, but will obviously be a lot longer, of course. Also, 2ml depending on the wattage you vape at and how much you vape. For me, it's kind of a hassle for an out-of-the-house mod. I vape it at 16W at 1 to 1.5 ohms and I chain vape. 2ml of 50/50 juice last me about 1 hour chain vaping.
As far as "box" style mods, I am currently loving the Eleaf Istick Pico 75W. I read that you prefer a nautilus mini. If that is the case, then just buy the mod, not the kit. Again, here are some offerings.
http://vapespider.com/?s=pico+75W+mod&cat1=115
BTW, you can use a nautilus mini on the elitar, but since the elitar is a 22mm mod, the nautilus mini won't fit edge to edge on the mod, but it will still work.
BTW: Both the elitar and Pico 75W take one 18650 flat-top battery.
But there are so many options these days, it's so hard to suggest something, especially for someone who is getting back into the game from even just 1.5-2 years ago. Things have changed a lot and, like I said, your options are limited if you want a tube-shaped mod like the Provari (as far as I know).
As far as the tank is concerned, since you were so comfortable with the nautilus mini, I would definitely go ahead and buy one if I were you and start back up with that. You can try other tanks later once you get back into vaping if you want to.