I got one of the newer lithium ion Dremel Stylus. It's much better and the battery lasts much longer. It's mostly replaced my old corded with flex cable setup.
http://www3.towerhobbies.com/cgi-bin...?&I=LXMYN2&P=7
The other is the Dremel 8000 LiIon.
http://www3.towerhobbies.com/cgi-bin...&I=LXFAS5&P=ML
Either one of these will be much better than the 7700 Multi Pro and I think they are well worth the extra cost.
Scott