There's always human psychic warrior 5, either going into
illithid slayer (or just slayer, since illithids can't be put into the SRD) or just staying plain psychic warrior.
Wield a ranseur and a gauntlet, use
expansion during the first round of the fight and move into position, so your massive reach (20+ feet) covers as many enemies as possible, then Improved Trip the Hell out of everything that provokes. Any time you kill anything (probable, given how much damage you'll be doing), you can then Cleave-Trip other critters nearby.
I'd say Con = Dex = Wis > Str > Int > Cha, with at least a 14 in the first three, but make sure you have a 13 in your Strength, for Power Attack and Cleave (your Strength can be boosted via
animal affinity, size increases,
strength of my enemy, etc).
1.
Expansion,[Bonus] Combat Reflexes,
[Human] Combat Expertise,
[1st] Improved Trip
2.
Vigor,[Bonus] Linked Power (from Complete Psionic, to improve your buffing and action economy drastically)
3.
Grip of iron (both for the swift action manifesting time - combine with Linked Power - and to help you grapple foes or escape grapples if need be)
[3rd] Power Attack
4.
Strength of my enemy5.
Animal affinity/body adjustment/concealing amorpha/hustle/psionic lion's charge (depending on what you want, since 2nd level psychic warrior powers are awesome)
[Bonus] Cleave
Since your Strength is frequently going to be boosted, and you get to make touch attacks (then regular attacks at a +4 bonus) you can Power Attack more without worrying so much about hitting. Later on you can get Robilar's Gambit and similar, and Shock Trooper to skive off your AC for attacks rather than attack bonus.
Later on you can see about taking
metamorphosis and turning into a hydra to Power Attack/Improved Trip/Cleave your way through entire battlefields of people. Just make sure you
expansion first.
If you don't mind losing some Dexterity and a feat, and gaining a point of Level Adjustment (which you can buy off), you could always try
half-giant instead.