Get something brushless, you have more control over the speeds without losing torque, so you can do much finer detail work. Have beaten the hell out of this one, never died: 

Expensive but we’ve burned through 2 dremels in living memory, so the extra power seems to pay off. About $120 though, not sure if you’d find a lot of use for it. MIne’s been a popular loaner

https://i.poastcdn.org/f0ceacf65a1eaabc9e2b70068e95f94700158da43d843cfb1b85ba01da8cadd7.png