Elemental Envoy feat ... is the level 1 pick, and still useful at level 4.
Should consider retraining the EE part away at say level 6, so now
it's a psicrystal. I like the Earth EE, but the Air for flying is good too.
Imprint Powerstone is a necessary workaround, of the Uniques limit.
Always have and keep.
Dragon mag has a +1 Uniques feat (that I'm blanking on at the moment).
Retrain away when comfortable with the class quirks.
Linked metapsi ... is pretty much standard anyway, and provides another
workaround the Uniques limit.
From there, you slowly turn the Erudite into a Psion build = see the guide.
If you have internet access ...
... and your DM can handle it
(yes you can you big strong dungeon master you)
the Mind's Eye expansions are helpful.
Link --->
http://www.wizards.com/default.asp?x=dnd/psm/20070629aPowergrace feat is a nice little Erudite only feat, worth taking a few times.
The variants have some real ee-vul powah available.
Erudite Spell To Power is near free multiclassing.
Big trick at level 7, is to use PsyRef to cycle through all the powers
and "learn" them into your repertoire. Hey look, it's something
an Erudite can do about as well as a Wizard.
Erudite doesn't prc well.
Erudite 20 is fine, as is Erudite 10 / Slayer 9.