If pocket friendly is something you want, one thing to consider with a tube mod is the length, you'll have the control head on top of the battery tube. A box is got g to give you girth, putting the controls and chip, next to the battery.
ZI use a vaporshark dna40 for my grab and go, with a small tank or dripper it fits in my shirt pocket at work completely unseen,
That said those run upwards around 140-150$ or theres a vaporshark dna30 around 60-70$ and that guy is tiny, not much bigger than a matchbox car-- but, there are some mods out that are good and less expensive about the same size, the istick30 and sigelei 30w come to mind first.
I would also suggest, making sure you can fire as low as a 0.5ohm atomizers, since it looks like most gear is heading that way.
With vaping you'' wamt to consider what you might want to do in the future as fast as our tech changes.
As for tubes, the svd, is nice if you like the shape, but rather long , the p3 would be ok,(but that's 200$),
The mark bugs like fictitious said, and honestly I can't think of much else with a highly reliable reputation in the world of tubes,
Theres also something like this, its a cframe dna30 with a fairly decent battery life
http://www.beyondvape.com/store/var...c-10_60/beyond-vape-solara-dna-30-p-1693.html
