I got tired of wearing dremels out and bought a dumore with a 5/32
jacobs chuck , Around 220$ US.
The downside is coarser abrasives come on 1/4" shanks.
The plus side is that it has outlasted everything else and will fit all
of the "surplus" dental bits.
By outlast, I mean 10 years commercial use with no problem.
A brand new one sits in a box just in case.
My next choice would be a Metabo brand die grinder that can collet 1/4"
shafts