Need 10" rough and round front; 1.6 gal versus 1.28 gal Cadet 3

I need a toilet with a 10" rough-in and want one with a rounded front because of limited space. The American Standard Cadet 3 can satisfy these two requirements. I have not been able to find a Kohler or Toto that can satisfy them.

What other toilets are worth considering that have a 10" rough and a rounded front?

If I get a Cadet 3, what are the trade-offs between the 1.6 gallon and 1.28 gallon versions? Does the 1.6 gallon Cadet 3 do a better job of keeping the bowl clean? Is there a difference in noise?

Toto makes a 10" round in the CST703.10, but it's pretty basic.
The Cadet 3 10" is a bit nicer.
The other TOTO 10" options are elongated.

The 1.6 will have more rinse water, but not much more.
I always suggest that if you can get the rebate, go for the 1.28
Noise will be pretty similar.