Hmmm... I think you got pretty much all of them... Maybe throw in a Butia Capitata or something.. No other really cold-hardy palms that I know of..

Oh yes, if you want, you could try a different (perhaps more cold-hardy?) type of Trachycarpus palm, once I recall owning some Trachycarpus Takil seeds, and the website claimed they had a greater cold-hardiness. I don't know, just a thought.

~palmsandsnow

Needle Palm and Sabal minor (and variants like Sabal "Louisiana", etc.) are easily your best options. Windmill Palm is an okay choice, if you don't mind protecting it occasionally, it's not as cold tolerant as the Needle and Minor.

Sabal palmetto is even less cold tolerant than the Windmill, it's truly a zone 8a+ palm, but it should survive in a good location and with protection.