The champ of all the 5-quart size Hobart mixers is the Hobart Model N-50. This is a real workhorse, 3-speeds, all metal gears, only complaint is that there isn't a spiral dough arm made for it. The mixer was originally designed for use in making small test batches of concrete and ultimately found its way into the food industry. As far as I know, all N-50s were painted only Hobart gray. Great mixer if you can find one, pretty scarce though. Another excellent option is to buy a used A-120/A-120-T (12-quart) or A, A/S, or AS-T-200 (20-quart capacity) Both operate on standard home voltage (110-V/15 AMP) both can be had with all the attachments including a reverse spiral dough arm. These mixers are actually pretty easy to come by as you will find them in most restaurants. The last restaurant sale that I was at had two A-120s that went for under $1,000.00 each. Not a bad price when you consider that it will most likely be the only mixer you will ever need to buy for dough mixing and if you should ever decide to sell it you can always get your money back out of it. These mixers stand about 30" tall so they are hard to put on an average counter top but a friend of mine who has one has his mounted on a bench out in his garage.
BTW: The "A" designation is the basic model, A/T has a timer integrated into the switch and the T/S has a timer in addition to a position on the switch which allows you to jog the agitator in a "stir" mode.
Tom Lehmann/The Dough Doctor