I'd definitely go the IPV MINI.
Saw this deal on gotsmok.
IPV Mini By Pioneer4You $59.95 | GOTSMOK.COM
Similar size to the istick, which everyone raves about being great. So much better in many ways. 30watts which is very good for anyone not trying to win cloud comps. Ability to fire lower resistance coils down to 0.5ohms. User removable/replaceable 18650 battery. Adjustable 510. If I wasn't happy with what I had, I would definitely consider the main contender with value for money, functionality and form factor. Paired with a lemo this mod will give you everything you could ask from it. And also give you the freedom to chuck on a dripper with .5ohm dual coil if you felt the temptation. I have a dna20 and I'm happy with 20watts with my Russian91percent or my cyclone+afc dripper. That dna20 cost me $180. It doesn't offer as much as this IPV MINI which will cost less than the $70 price point you set.