Hi !
I love vivi novas; I use the mini ones and must have vaped half a litre of e-liquid in them without leaks of any sort. Occasionally, I pull out the plastic drip tip and spin a bit of tissue paper in there to soak up condensation-juice, but otherwise, that's it.
I also have evods, and an iclear16 and also a totally wicked dual coil (RCS K3) 1.5 ohm clearo
Evods are generally not too bad, they gurgle when low on juice and can be a PITA if you re-build them with thin wick.
There is a new Kanger (T3S) which seems to be finding some friends. Also, there is a mini Protank, which I am very keen to try, but I don't need to "up" the clearo count to a dozen in all honesty.
I have enjoyed the Totally Wicked clearo....it makes thick and tasty vapour, I thought I might regret buying it, but no.
The iClear16 sometimes throws out a little juice, but not very often.
T3s are a disaster for leaks. Mini novas seems more reliable than the full sized ones. Most of these clearos don't like being shaken about too much.
I'd get 2 evods and see what you think. I prefer the vape on a Nova...don't know why.