Don't know much about those brands, but the YES tractor and the Minny tractor seem to be almost identical to some chinese walking tractors such as the Dong Feng and others.
I do know that the Goldoni is available in the states, as well as the Bertolini (possibly). The China tractors are still impossible to import, but thy sure look cool. Goldonis are probably close to $6000 new, though.
If you are dead-set on a new walking tractor, the most readily available will be the BCS, since Gravely stopped production of their wonderful machine. No love for the Acme engine on them though, although I understand a new BCS can be ordered with a Honda powerplant.
I will now include an "animated icon" for your amusement.