williamiii,
It probably comes down to bonus feats and ability scores, race and garbage WotC mechanics. I have not compared CM v. PsyTheurge v. MT bonus feats in a while, but am guessing they are close. L5 Wiz does have a couple bonus feats on L5 Sor IIRC. At Epic levels, 2 extra feats can be mighty handy. Depends on how much value is placed on spells / day v. feats. In order to use multiple meta-psi's at the same time, you need to waste feats on getting more psi-foci and reducing meta-psi costs (i.e. Imp Meta-Psi III). If you plan to use the PRC to mitigate the garbage mechanic, Psi can be fun, if not, Psi will waste too many feats. Arc / Divine meta-magics synergize, but the meta-psi's don't mix - which wastes feats.
I like the Int based synergy in that you have the same primary ability AND you have great skill points. Although the L5 Arch BAB is 1 lower than L5 CL, you've got Div Power, so it should cancel later. You do miss Divine Might / Shield by losing turn undead. I'm guessing that is not a deal breaker. DM / DS can help for Nymph / Rak builds.
Your INT based builds would certainly be stronger than my MT build due to synergy v. MAD. Does this mean a .bic post is imminent?
If you go the Wilder route, you may want to hold the last level at 39 or 40 because Tumble is a Wilder class skill.
Nymph and Rakshasa are the best Cha types. Nymph for AC & saves, Rak for uber SR. If you have Epic Spell Reflection, the Nymph is a little better.
Mindflayer is generally best for Int based + uber SR.
If you want power, take a look at L10 Lich. Heh Heh.