I have an eGo passthru, works connected to USB or on the go, with smoktech 1.5 dual coil cartomizer. I get good vapor, and TH. The passthru comes with just the cord, so cartos are extra, but you can get them for around $2. The juice you can get from a lot of different vendors with different nic strengths but I DIY mine, using Humco VG and 36mg nic from xtremevaping. Just what I use, everyone has their own tastes and preferences.
Balth