Psionic Meditation is a very good feat if you intend to use metapsionic stuff or other things that require you to expend your focus. Psionic Body is nice if you're going to take many other psionic feats, although you need to take a lot of feats to make it better than Improved Toughness (Psionic Body: +2 hp/psionic feat, Improved Toughness: +1 hp/level, both are continuous so if you take more feats or get higher levels, you get more hp from them). Expanded Knowledge gives you access to powers from other discipline lists, letting you take powers like Suggestion, Hustle, Schism, or Inertial Barrier. Item creation is never wrong, even though it's not quite as good for a psion as it is for a wizard or cleric.
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