Right now I have a
Bo'sun RDA, Very nice atty, Dual Post Velocity Style with huge post hole very easy to build on it. Very Deep juice well, with side and top airflow.
I also have a Veritas Clone by Tobeco. Nice flavor but it's a pain to build on it.
I have a teapot by iCloud mostly for visual novelty effect, Good flavor but I broke the glass top. I also have a lemo 2 good rebuildable tank but I tend to use it less and less in favor of my dipper. It has a decent deck but compare to my RDA it has very small hole and screw so less that ideal for anything other than simple coil.
Also I like to constantly rotate juice so RDA is better for me. All on a mech tube mode with LG HB6 18650 nice 30A battery but not much capacity so 4 of them in constant rotation.
As far as Diy I order some flavor from nicotinelab, Their fruit flavor are good. The tobacco flavor not to my taste. Good tobacco flavor are hard to find. Right now there a Montecristo Aficionado e-liquid that I like and a French Pipe e-liquid from a local shop that good. Every other tobacco flavor I tried are meh very artificial tasting.