I like the idea of combining ToB with psionics, too; just need to find the time to actually sit down and flesh out True Psychic Warrior (10 level, full BAB, 8/10 manifesting with access to Crashing Wave, Diamond Mond, Giant's Grip, and Setting Sun) which will sort of center around Telekintec Maneuverer, sort of a psionic/ToB Master of the Unseen Hand, executing strikes with its mind, etc. In the mean time, I've got the psionic adaptation of my soldier base class and the Soulsword swordsage variant.

I'll definitely keep mulling on ways to combine ToB and XPH, and if you've got any other feats/variants/prestige class ideas in that vein, I'd be happy to have the help.