Ta Shade. I'll have a look - if I can find the time!
I'd say it needs to be aberration, but that's just me...
Make them psi-like, I think, since that's how illithids work, right?
Cleon said:1st - control light, defensive precognition, matter agitation, offensive precognition, thicken skin
2nd - biofeedback, chameleon, psionic levitate, mental disruption
3rd - telekinetic force, body adjustment, energy burst, telekinetic force
Also, let's give 'em spell-like psionics, like non-psionic illithids, and use an underbar for the true psionic version.
For the PLAs, Cleon has proposed:
Psionic illithids are 9th-level psions, so I don't think we'll eclipse their masters with these proposed abilities. 3/day for the 1st-level powers, 1/day for the 3rd, and split the 2nd between the two usage levels?
Once we figure that out, we can find non-psionic equivalents.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.