
to the forum, Ted.
I would agree with Andy. Try to stay away from the Model Power. They don't have a very good reputation. I would go with the Roundhouse Critter (but I'm biased, I have two of them). Very smooth running and surprisingly powerful given their size.
The biggest drawback to the Critter is the short wheelbase. I'm in the process of wiring mine together because they sometimes stall out over the frog on a switch. Another option if you're looking for small motive power would be an Atlas or Proto switcher. With the eight wheel switchers, the stalling problem goes away due to the longer wheel base.
Tom