I hear you. I hate being in a rush. When it's done, I always feel like I could have done something better. Not this time...
I can get a (mostly) working core from the pick-a-part soooo cheap. It would be silly to try to pull my current trans, rebuild it, and reinstall it in any reasonable amount of time. Plus, by doing it this way, I'll have a working transmission on the shelf as a backup in case anything happens to one of the 3 supercharged w-bodies in the family.