I've used band grinders for close quarters, if there's room enough. HF
has a conversion kit for an angle grinder cheap, if you just want to
try the concept out. I've got my eye on one of the pneumatic dedicated
units, though. The HF unit works well for snagging castings and welds
in odd spots. Just not going to be that long-lived, it's cheaply
built.

Here's one type, there's other sizes:
http://www.use-enco.com/CGI/INSRIT?P...&PARTPG=INLMK3

There's also a pneumatic right-angle micro die grinder:
http://www.use-enco.com/CGI/INSRIT?P...PMAKA=801-1685

Both on sale, how's that for timing?

Hope this gives you some ideas

Stan