Spells useful well past their own level

[DragoonWraith]

So I'm playing my own Cerebremancer, with Sorc 1/Psion 3 entry. I'm currently level seven, meaning I have the casting of a 3rd level Sorcerer (CL 5) and a 6th level Psion (Telepath, ML 7). So I need spells that A. aren't replaced by my Psionics, and B. are useful despite getting them much later than I would otherwise. I still lose another two levels of Sorcerer casting (at 9 and 12), so I can be up to six levels behind (possibly more depending on what I do after Cerebremancer), so they definitely need to be things that last.

Any suggestions? I currently have Summon Monster I, Ray of Enfeeblement, and Detect Secret Doors, as well as Protection from Evil from the Celestial Sorcerer Heritage feat. Any sources are fine, though SRD is preferred.

Moved to Roleplaying Forum, where it belongs.