I'd say based on those parameters, look at the Provari (my personal favorite), SID, Zmax Telescope V3, Vamo V3, and maybe the MVP. Check out Pbusardo's Youtube channel and watch his reviews. He'll give you good insight on what is good and bad about each unit. By the end you should have an idea of what will work for you.
For on top of the mod I'd look at carto tanks (see Baditude's blogs for lots of great info) and maybe the Kanger Protank or Vapeonly BCC. Personally I don't like plain cartos. But, I find carto tanks have the best flavor, TH, and vapor production for a relatively hassle free on the go type of device. But, they do have a learning curve. Not bad, but it's there.
A couple of Twists, Spinners, or Winders would be good to have as backups. Toss on an Evod and you have a great sleek looking unit.
And always remember... Back ups for your Backups. I always carry my Provari w/extra batteries, a Twist, a standard eGo with a T3, and 3 carto tanks. Everything but the Provari fits in a large eGo case.
Hope this helps your search some.