Digital scales:
I bought a Dillon many years ago. Checked it often against a balance scale. Never a problem.
I've had a RCBS 1500 for a couple of years. The scale can be purchased separate of the powder dispenser which can be purchased later. No trouble with this either.
It is important to keep any other electrical devices away from them.
That being said. You don't really need a digital since your not going to measure for each load, only set the powder dispenser and dump the charges.
Depending on how fussy you want to be for 5.56, you might want to add a powder trickler to your list.