Ardent 10/Slayer 10
Dragonborn Elf
1-Battle Jump
3-Track
6-Leadership--->Linked Power
9-Power Attack
12-Leap Attack
15-Psicrystal Affinity
18-Psicrystal Containment
4 Elven Weapons-Invisible Power, Psionic Meditation, Node Manifesting, Metanode Power
Our cohort will be the erudite described multiple places, sticking around long enough to give the C-L access to every spell and power in the game. Once we have those, Psyref out and back in to get one of our many umpteen zillion CL wizards/mind mages/whatever to make the node. We'll have all of three feats tied down (Track for PrC, Linked Power to avoid XP costs, Psicrystal Affinity to keep the pet rock), and the rest are utterly mutable. The two node feats functionally are, if we want to use our node, but even without, the raw stats on this guy are impressive. 19/20 manifesting, 17/20 BAB, all weapons and armor, all spells and powers, free metapower from dominant ideal, even more from the node, mad ML from the node, and of course we can Psyref in a recharge. The above setup is an "all-around" if you will, able to one shot the big guy the C-L was built for (just manifest Giant Size first for reach) and still kick ass as a manifest if he wants thanks to Linked Power being so efficient. You've also got the beauty of unbreakable nondetection and mind blank, without any of its inherent problems.
Alternately, go Ardent 15/Abjurant Champion 5. Full manifesting, same deal with a single feat tied down (in this case, Combat Manifesting), AC buffs, options for buffing saves and attack/damage/resistances.
Next up, if you don't care about annoying things like base attack bonus, you can go Psion 6/Anarchic Initiate 4/Slayer 10 (ironically 16 BAB) or Psion 5/Anarchic Initiate 10/Abjurant Champion 5 for near full or full manifesting with extra support for Overchanneling. Only problem with Psion is no dominant ideal.