Your unknown is one of my favorite corals in my tank. John (lobsterboy) told me it is oxypora but it also looks identical to another coral someone called hollywood stunner chalice or something? I don't recall where I saw it but it's a canreefer's tank.
Edit:
I did find it (scroll down a few pics):
http://www.canreef.com/vbulletin/showthread.php?t=67198
and here's mine:
