I've been through a few of these over the years, both cheap ones and not so cheap.
The cheap ones usually die after a year or two (sometimes less, one lasted me about 4 years), the more professional brands seem to last at least 4-5 years, often more, and are generally better quality.
I got a JNC660 for Christmas last year to replace the dead Peak brand box I bought at Advance about 2 years ago. It's more than $100, but well worth it IMHO. There is no separate charger needed, just use a short extension cord to charge it (not included, but any normal cord works). I would say it's a smallish version of what you might see at a shop, or on a tow truck or service truck. No bells and whistles like air compressor or "work light", just a good jump box that I hope will last a long time.
http://www.tooltopia.com/solar-jnc660.aspxI don't have any first hand experience, but if you want something cheaper, I'd think about this one:
http://www.tooltopia.com/solar-jnc300xl.aspxLess power, but smaller and cheaper.