Considering that Aramis' focus thus far has been on Incarnum spells, I think another option might be to focus a bit more on Incarnum Spellshaping.  You can invest essentia into Incarnum spells at the time of their casting that gets returned to you once the spell's effect is over; what about a prestige class that lets you swap essentia around between different active Incarnum spells as though they were soulmelds?  Add in some increases to your essentia pool and the essentia capacity on your spells and you could probably get a nice 5-level PrC out of it, at least.