I use a few different high speed hand grinders, both electric motor and air diven, for engraving, fine milling work, and peck drilling small holes.
Here is link which shows a few different ones.
http://www.machsupport.com/forum/index.php/topic,12484.msg88231.html#msg88231The top one shows a handpiece from Grizzly. I purchased the motor and two hand pieces, one with collet and one with a chuck, modified the
handpieces to remove play and was around $100 total when it was on sale. The modified handles are better than a lot of name brands which cost a lot.
Made a few genric holders so they can be used on the lathe, mill, engraving machine and sensitive drill press.
All depends on what you want to do, but something to think about.
RICH