Campbell Hausfeld Mini Die Grinder —
I been using this for running a wire brush to grind rust . Also for running polishing wheels for 3 summers now. I run it (abuse it) for hours at time. It's a little shy one the horsepower for polishing (reason for 4 stars) but for the price you can't beat it! It will do fine for buffing wheels under 3" dia.
Just keep it oiled. I let mine sit for too long after getting if full of moisture and it seazed. Took it apart, reoiled and works like new! (my fault, not products)