I use one of these all the time:
http://www.proxxon-tools.com/tools/P...nder--789.html
Its dynamite for getting into tight spots and small parts. You can tilt the sanding belt to different angles depending on the job. It even has a port for dust collection, which I dont use, as the hose is in the way all the time.
Its variable speed, but that is a feature that is not important. Its "high" speed is not very high.
On the negative side its very effective and if you hold in one spot for a moment with a little pressure, it cuts a groove. Try it on some scrap till you get the feel for it.
D
"The best thing about building something new is either you succeed or learn something. Its a win-win situation."
--Greg Westbrook