Well, whatever you choose, don't be put off by small volume of the tempering machine.
As long as you don't add more than one third of untempered, roughly -the-same-temperature-couverture to the tempered, and let it rotate for a minute or two, you're fine. I did more than one order of 200+ dipped strawbs with just a revolution2 machine using this method, and it works just fine.
To be "speedy" you can keep the metal bowl(but NOT the baffle) of couvertue overnight in a gas oven with just the pilot light on to keep it liquid, so the tempering part only takes 10 mins., or you can nuke the metal bowl in 30 second blasts to liquify the coverture so it doesn't take so long to melt and temper.
Yeah, yeah, I know.... But I've been doing this for years now, you CAN nuke metal bowls, just make sure the bowl doesn't touch the sides of the oven or have a metal spoon touching the bowl or oven.
One caveat about tempering in a restaurant kitchen: Watch your humidity and heat in the area you're working in. Best if you're in a separate room, or if not possible in the early morning when the d/w, steam table, and ovens aren't running.....