quote Nytmare: This is straight guesswork on my part since I've never actually played with 3rd Ed psionics, and I only have the Psionincs Handbook, but my gut feeling is that they would grab one extra psionic combat mode for going straight 6 in either Psion or Psychic Warrior.
but the (horrible) system of combat mode has disappeared in the golden XPH!
@Azurecobalt: I think the power increase is already managed via Overchannel (and Talented), and some have spotted a loophole using Psionic body and then going Psionic talent all the way (thus increasing PP/day exponentially and HP linearly to an extent Toughness user only can match)... and provided a patch for that.
As for the Wizard, I think giving them a single 4th power, perhaps with more limitation (but less so than the std way, i.e. Incantations) will do.