Epic psionics clarification/builds?

[eternalrest]

Hi, i am trying to build a higher level epic psion and have run into some problems. Firstly above 21st lvl in the primary class you dont gain any psion levels right? So the only way to gain PP is through epic feats and PrCs right? If so can someone give me some suggestions of what base class to take and what PrCs would provide enough PP and or class features to stay relevant? Epic psionic feat has been banned so i think i will need to focus on metapsionics or class features to be decent. Likely going with psion or wilder as my primary class tho i am open to switching

ECL is currently still being decided but expect around 40-50 lvls, LA buy off should be allowed.

Also side note is there any psionic monsters that would actually be worth well to play at epic levels? Like aboleths or mindflayers? Those seem pretty cool so any suggestions will be nice.