the current tube PV for most standard user seems to be a pairing of 1) variable volt (like ego twist, vv spinner, dial a volt) + 2) carto / cartotank / clearomizer (current top are vivi nova, iclear30, evod and kanger protank). I move away from the mini which the performance to me is just no good enough (i was previously using smokeless image product - having the volt and volt x2 battery - tried their nano clearomizer, ce3 and carto)
- i am currently using an ego twist + cartotank (LR boge+smoktech dct)/kanger protank. its been great, the only downside to me is the look is not as stealth as I would like it to be. but I have no issue with leaking or whatsoever (you need to learn and understand the top system).
If $ is not an issue, vaporzeus is one setup that seems to be a good choice if it was up to me because 1) looks like a cigar for stealth 2) performance @ 5v which is better than my twist 3) high capacity carto for less refilling (you need to learn how to use this properly or not you will complain the hell out out of it)
if you got more money and not interested in tube PV but box PV - reo mod are highly popular and their fanboy swear the ease of use.