Compact toilet?

The front lip of my current toilet is about 27.5" from the back wall, leaving only a foot of knee room. Can anyone suggest replacements that will leave more knee room?

The bottom flange is about 6.5" from the wall (3.5" clearance from a baseboard radiator that extends 3"); overall flange is about 17" front to back. I think the brand is American Standard, but there's no logo visible.

Any replacement must have a powerful flush. It would be great if it were available in blue, but I'll forgo the color match to get more knee room.

27.5 from the back wall is compact.
That would be something in a regular bowl.
Most drains are 12" from the back wall, and having a heater behind won't help you much. Can you post a picture?