Wouldn't UltraHumans be the ultimate, pinnacle of humantiy? That is, once you're an Ultrahuman you're incapable of further advancement. The idea of post-humans, entities which are no longer human, doesn't exclude advancement and continuing evolution.
Also, Ultrahumans sounds like the title of a Saturday morning cartoon. Post- has a clean, scientific sound to it. Ultra- is more exciting, but also seems a little goofier, etc.
Those among the public which look at our philosophy with utter disbelief won't change their minds because we change a few terms. As far as I'm concerned, it doesn't matter what the general public thinks. The relentless march of technology is unstoppable leading either to a posthuman future or total destruction for humanity. Those of us with the foresight to see what's coming will best be able to take advantage of the changes. The others will be left behind.
I think our movement would be better served in pointing out the problems associated with following emotional, irrational or dogmatic beliefs. Until the general public begins to discard superstitious religious beliefs and begins to more readily embrace science and rational thought, we're not going to make much headway.
Like someone here said a while back - we're gonna drag the rest of humanity kicking and screaming into the posthuman future whether they like it or not.
Terry Donaghe: firstname.lastname@example.org
"If you love wealth more than liberty, the tranquility of servitude better than the animating contest of freedom, depart from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains rest lightly upon you and may posterity forget that you were our countrymen." --Samuel Adams