A mech mod is not really a requirement for a sub ohm build, but any regulated device will need the ability to power it at the sub ohm level you choose. In other words, it will likely be an apv (higher end) type. With a little info and basic skills you should be able to use rba's without a problem on your vamo or other similar devices.
If you have a Nautilus, getting a Nautilus mini is a good choice, because they both can use the same BVC coils Keeping up with only one brand/style of coil is always cheaper. I've had my Nautilus for only a couple days now, and been using Kanger single and dual-coils for over 6-months. Now I have 3 coil-types to keep up with But, I must say, KPT2 and AeroTanks have served me well, and I find little difference between my AeroTank and my Nautilus, with slightly more robust flavor from the Nautilus (mostly based on the chimney design - more like Kayfun/Russian), but I can buy two AeroTanks for the price of one Nautilus (and the coils are <$1 each, compared to $3 Aspire coils).
There is a ton of info, basic, and more in-depth in the cloud-chaser sub-threads... pros and cons of different devices, coil-building, wicking, juices, and above all else... SAFETY when dealing with an RBA/RDA and Mech MOD!
