I would caution against the Subtank line of tanks. As a vaper that uses both the subtank and the aerotank, they are worlds apart. If you want something that vapes anything like an aerotank, you won't like the subtank. It isn't really made for MTL vaping and the vape is just different due to the vastly different style of coil heads. Even the Aerotank Plus will be a letdown because it takes subtank coils, so it vapes like a subtank, not an aerotank.
Not that you have to worry because it's not easy finding a subtank these days, just as it's hard to find aerotanks. But I'm looking for ya. I also know a place where you can get coil heads very cheap to stock up on.
I'll be PMing you in the next few days as soon as I do some looking around.
Edited to add: That MOW tank mentioned above is not 510 threaded, it's ego threaded, so unless you are using ego threaded devices or have an adapter, that won;t do. They made that same tank with a 510 thread called the EMOW Mega, though. Same as EMOW is the same as the MOW but is 510 threaded. Both are just redesigned Aerotank Megas with non-replace the glass. Sharp looking, though. I have 3 EMOWs.