Hey now. Don't forget The Mind's Eye archives. It's 100% official, and as long as you stick with the 3.5 articles (Just Say No to 3.0!) you'll be fine.

If you're looking at the shaper (that's the psion class that focuses on metacreativity) and you want to focus on astral constructs, definitely look at the 3.5 constructor.

Just remember that the strongest manifester is a single-classed psion; prestige classes (except for a single PrC, the anarchic initiate, from CPsi - not well-balanced at all) all lose manifester levels, but most are fairly balanced.

Except for the metamind. Avoid it like the spellplague.

If you can use 3rd party material, there's Hyperconscious (written by Bruce Cordell, primary author of the Expanded Psionics Handbook), the prestigious (and very well-balanced) books from Dreamscarred Press, and my revamped psionic powers revision (which is an attempt to rebalanced the entire core psionic manifesting paradigm - show it to your DM to see if he wants to use it in lieu of the XPH).

Just make sure your DM is okay with whatever you choose to use.