Robert Ranting advice is awseome as always.
May I humbly add:
Transcendance akashic feats.
Any divination spell appropirate ot the level of the akashic ability.
Any feat.
Here are a few I designed on my blog awhile back.
MINOR AKASHIC ABILITY
Recall Weakness: 1/day you may make a Delve the Collective Memory check (DC 15+Challenge Rating) as a standard action, to determine how to bypass a trap or defeat a foe. (Examples: A xaaer is vulnerable to undead effecting spells, thea trap cannot affect someone standing in the square just to right of the door, a magic weapon will harm an evolved gargoyle normally etc. )
LESSER AKASHIC ABILITY
AKASHIC LEARNINGWhen gaining a new feat or skill, you are guided by the course of history and able to predict what will benefit you most in the future. While this ability is far from perfect, it does give you a distinct edge. Each time you gain a feat or skill points, you may delay selecting them. Instead of spending them immediately, you may opt to select the feat or skill at any time in the future before you gain your next level. If you gain a level before making your delayed selection, you must make the delayed selection immediately, before applying the new level. This allows you to simulate having trained by the akashic memory rather than the traditional sense. It does not negate prerequisites for feats or allow you to take skills you do not qualify for. If a feat or skill requires special training or ceremony to be selected, those must have been available at some point between when it became available originally and at the point you make the selection (DM Adjudication).
GREATER AKASHIC ABILITY
Akashic Possession: When you die your experience take up permanent residence in the collective memory failing to merge with the rest, when an akashic attempts to delve the collective memory and examine one of your experiences (DM ajudicaiton) using any of his akashic abilities he makes a saving throw DC 10+1/2 your akashic level + your charisma modifier, a failed save results in the delver’s memories being shattered and destroyed and are replaced. (base creature loses all mental ability scores and class levels; replace them with yours at the time of death except you are one level lower, this level loss cannot be regained except through normal advancement). A successful save results in that creature being