If you're still not sure about Psi- , then consider a recharge set-up.
It's not overpowered with the short list manifesters, like PsyWar or Lurk or Divine Mind, up to and including Wilder and Ardent.
They all don't have enough powers known to really screw things up.
Some infrastructure investment, like Bestow Power, Leadership slightly limited , feats , skills , just get those discounts.
Somewhere around 10th to 15th level, you are really good.
Psions or Erudites with this are bordering on broken good , from 6th level to 15th level.
But even with recharge, the lack of 9th level spell options, un-breaks the combo.
In current parlance ... Wilder and Ardent recharge are Tier 1 from 10th to 15th level,
but Wilder sags above that, Ardent depends very much on what the DM will allow with Mind's Eye Substitute Powers.
Psion with recharge is High Tier 1 from 6th level up, but has to take different tactics when the 9s show up.
Erudite with recharge is silly. Is there a Tier 0 (zero) ?!
Divine Mind is about equal to an Adept.
Divine Mine with Recharge, like Consumption Aura and someone else having recharge, isn't as good as a Warlock (ouch).