The other great area is further south on the Canal du Midi. This goes from the Atlantic coast near Bordeaux all the way down to the Med near Beziers. A bit too far for a one or two week trip but the stretch down near the Med is beautiful. Not saying this is better than Burgundy, just another option.

Can't help with boat rental companies as I've been looking to buy my own. Le Boat as mentioned earlier is part of the TUI group same as Moorings/Sunsail so you can be pretty certain of what you'll get but there are many smaller outfits that are probably just as good.