Revidere
I protest on the grounds that Duke is evil!
Corinthian?
Yay! Focused in on the pedigree/sales priced-related hints and worked from there! As a pedigree nerd, I must add the obligatory "WHAT A COOL MARE!" comment.
Yay!
Glorious Song?
Key for me was being sired by an Arlington Million winner... a group not known for their siring prowess!
Ventura?
The last two clues gave it away. SUCH a handsome boy!
Rock Hard Ten?