Ok, time for someone to answer your question honestly. You are either going to be a rebuilding person or not. The suggestions for the Nautilus tanks and such I'm sure were meant to discourage you as you seemed to not have full desire to rebuild. I personally never looked back once I got my first dripper. I would suggest you look at a simple dripper to hone your building skills. Don't forget the gear you need to get started. Not just wick and wire, but ohm meter, coil jig, cutters, pliers, etc. It's not real expensive, but you need it all before you get started.
The one suggestion you were given on the sub tank was actually good. Gives you a RTA section to work with when you feel like it and replaceable coils for when you don't. I'm just not huge on the Kanger line of products.
Now, if you do get hooked on rebuilding, it's amazingly addictive, Then I firmly believe there will never be a best atty for you. IF you find it let me know, I'm in the process of determining what will be now my 4th RTA. That's just plain ol' "shinyitis"!