For a corded Dremel I would choose
http://www.dremel.com/productdisplay...sp?SKU=3956-02
For a cordless Dremel I would choose
http://www.dremel.com/productdisplay...ls&SKU=8000-01
This is the one I have.
I used to have the corded one I listed above without the flex attachment. Both are great tools.
Good luck!