I would recommend these.
http://themicrostart.com/
Guys at the dealerships were eating them up off the tool trucks. I've used them personally in the field and the Snap-On dealer junmped a V8 Tundra about 10 times in succession with the vehicle battery completely disconnected.
Batteries, especially lithium, vary greatly in quality. All these Vapers you see blowing them selves up? Cheap, Chinese lithium batteries. Spend the money now for a quality piece and save you self headache later
EDIT: Not saying the ones previously recommended fall into that category, but I would expect to pay upwards of $100+ for a good quality one. I would start getting suspicious around $60 (regular price, not sale price)