I own a printrbot and it ticks your boxes. See here : http://3dprintboard.com/forumdisplay...rintrbot-Forum

If you're worried about the quality of the manual, you can fin it here : http://printrbot.com/support/

I'll take a guess and suppose you mean FDM printers only. From what I see I think that other builders are also meeting your criteria, their owners will comment :
Lulzbot
Flashforge Creator
Ultimaker
Hyrel