Originally Posted by ac_elite
A Douglas AZ to cross
C Creel to enter the Copper Canyon area
E Guachochi to exit Copper Canyon
I San Luis Potosi
J Santiago de Querétaro
K Mexico City
Torreón is a non-descript factory town and is the one town on your list that if I never see again my heart wouldn't be broken. That said, I'm riding through it again on the way to Durango in two weeks and change.
Bato's principal road is under heavy construction and the condition of sections of it varies widely day to day.
Saltillo is another factory town (cars) but has a somewhat charming city center. Of sorts.
You should stop at San Miguel de Allende between I and J
Best on your list (subjective) is Oaxaca. Allot more time for Oaxaca. See the ride report below.
Reward yourself with a beach rest somewhere on the Oaqueña (state) coastline. Mazunte and that region will do fine.