Have you tried a Fein? They're supposed to be very good power tools. A lot of people like Hitachi too but I'm not sure about a 4 1/2". Surprised about Metabo as they usually have a slip clutch.
Lanse's new grinder should be OK as long as he doesn't lean on it too much. I had an old B&D 4 1/2" that I really liked but used it on something a little too big. I like the paddle switch better than a trigger.