Thanks Pete, I never noticed Prime cuts in costco, though I never looked for them.
An inquiry will be made with the butcher there.
It was suggested on the other forum not to spend the extra coin on a prime graded cut.
I'm starting to suffer from a bit of info overload, not a bad thing, it just means I have some decisions to make.
I think I will go with Moses method on a costco choice cut.
Until someone else posts something that changes my mind

All the info has been great! Thanks fellas