Magic of Incarnum - and don't forget the 1pp Cognizance Crystal, to have the 1 pp "available", so you can re-obtain Psi-Focus after expending it.
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G Cheese - why'd you go and post the Tier 1 thread already?! Yer stealing the thunder of the Tier 2s. It's not fay-yer (pout).
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Ardent
Pro - Very easy psi-Gish builds. Access to any power via Mind's Eye Substitute Powers. Tleilaxu_Ghola liked them so much, he made TWO threads about them. CO-trickery makes it the psionic early entry and early advancement class. Think of it as a Psychic Warrior without the feats, but with 7s 8s and 9s. Can be used to "fix" any ML losing PrC, thus un-violating one of Caelic's commandments. Can take Schism and Metamorph earlier than any other Psi-class, so you win. Can lose 4 ML but still have it's full top end casting. Can lose
7 ML and still have access to 9s. Is the preferred dual caster class, for Psi + Arcane or Divine.
Con - Without Mind's Eye updates, the power selection was/is very funky. You have 1/2 the "spells" of a Cleric, that does almost the exact same things. You have to take Practiced Manifester feat, to get the most important rule advantage. Can't really be built for a Lock-style build. Carnivore still preferred Psion over Ardent, when making Tashalatora Monk builds. You have to open the Complete Psionic book to read about it, and make a saving throw against nausea ...