Hi there,
I'd buy 3 each of Norfolk and Western K1 engines and/or Class A engines.
I'd buy 2 each of Norfolk and Western Z1b engines and/or S1/S1a engines.
Several Z1b engines also went to Rio Grande, I do believe. It's just another legitimate name to put on them.
Sunset could easily do a better Class A than anything that is out there now. I'd think there would be an appetite for this iconic engine to be done well.