Garthanos
Arcadian Knight
I think we really are getting to the point where something like Unearthed Arcana for 4e could be a good supplement, and give the 4e designers some guidance as far as future supplements. I just don't see myself buying to many more PHB's, power supplements or another Adventurer's Vault... Even now I feel like I have enough combat crunch to last me a lifetime.
Admittedly I got an itch for the psionics system as an inspiration for other stuff so might be reasonable to absorb it in more completeness... before I feel like UA is in demand.