I thought I would update my last message based on the comments by others listing the American Standard Champion models.
It appears the Champion is a newer model and may be even better than the well known and recommended Cadet line.
The primary difference appears to be the larger 2 3/8" trap in the Champion compared to the very respectable 2" in the Cadet. Based on the specifications and the claims by American Standard, the Champion is the Champion. I will guess it will be more expensive, but I am planning on replacing one of my toilets in the not too distant future and I will try out the Champion.