Alternator repair question

[xlr8nflorida]

I have a replacement acdelco alternator in my lt-5.
The original alternator is in box and needs rebuilding.
A local shop said they want 85 bucks unless it's all torn up and it has 90 day warranty.

Rebuilt means various different things. To several it means just fixing broken stuff and leaving the rest if it that is functioning.

I would think I would like the whole thing rebuilt as to prevent future issues.

Thoughts and prices paid and services rendered for those who have had their alternators replaced??? Thanks!