I decided against air-powered - noise and needed more air than my old compressor could supply easily.
So I went to B&Q and bought one of their cheap sanders. It does my job nicely! OK, the bearing in the bottom plate went after a couple of years, but I got one with two shields from "Bearing Boys" and it's still working well - if somewhat dusty! At £20 I reckon it was a bargain, though I suspect Wickes etc do the same machine under different brand names.
OK, it may not be as clever as an expensive air machine, but it is certainly a budget buy
