Miriam, I got an adjustable dremel for the holidays. My DH hunted for some time to find one that is variable speed, and ended up getting it at wally world. However, I am disappointed because I can't find an adjustable chuck for it that will take 1/16 size attachments.
I have been going back to my prior, cheap dremel that I got a hand attachment/foot speed pedal for, since it adjusts to everything.
Cil