I have an American Chocolate Mould Company table top tempering machine with extra bowl and blade. I've used it probably 100 times, still working great. Bought new direct from manufacturer last fall for $850. Willing to sell it used for $500 plus shipping.
The capacity is 10 lbs, but I found that it worked best with 5-8 lbs at a time.
If you want small, I have new Rev 1s for less than $200. It's a small capacity at around 1 1/2 pounds of chocolate. Pieces are dishwasher safe. Chocolate, cocoa butter transfer sheets, mold, dipping tool and extra scrapers are also included in this price. At this price you can afford more than one. This deal is only good through the end of September.