Well, I vape a AGA-T on a K100 that I really like. This setup is my favorite for at home. Not so good to take out because the AGA leaks when on its side. I build with SS mesh and 27 gauge Kanthal for 0.6 ohms. I use MNKE and Sony 18650's with all my mechs. Great flavor! The AGA takes a bit of time to lear how to build, but once you get it, it's not bad at all.
My other fave is a Vmod bottom feeder with a IGO-L drilled out for BF'ing. I use micro coils with cotton wicks on that. Much easier to learn to build because you don't have to deal with getting rid of shorts through the SS and a great vape at 1 ohm. You don't need to put the IGO on a BF'er, it just means I get the advantage of not having to actually drip to get the benefits of a dripper
I've got a Trident coming from FT. It takes single or dual coils and has adjustable air flow. This should be a blast!
All of this gear is pretty inexpensive and works very well for me.