Agree with the Excalibur Dehydrator. I retired the nesco and upgraded to one of those. I just dried 15lbs of habs a few months ago with mine. Works awesome.
I dry mine whole, as I've heard if you cut them it will let some of the flavor/capsaicin out. I use a ninja to grind them, even grind them inside. The family has gotten used to about once a month fumes in the house, they just stay out of the kitchen for awhile.