^I made a 15th level Psychic Warrior/Crusader that might be applicable for half of your gestalt. Link to the character is here:
http://www.myth-weavers.com/sheetview.php?sheetid=128292 To downgrade, just drop the monk level. Alternately, drop one other level, and take tashalatora.
Basic idea is that this guy never ever dies. He works best as an Elan, but he can work as any race. He just soaks up a ton of damage every round. Here's a round by round:
First of the day, get some Claws of the Beast, Share Pain with your Psicrystal. Before going into danger, use Thicken Skin and Emphatic Feedback
Link power Expansion + Grip of Iron, for a huge boost to grapple check, link power Hustle to Strength of my Enemy. Somewhere in there, put on Claws of the Vampire, possibly on round two linked to a hustle.
Next round, you have a ton of grapple check. So use it. One enemy (unless freedom of movement) is out of the combat (I suggest you add in Scorpion's Grasp to get improved grab, this one doesn't have it because it was built with limited splats), and the others may want to attack you. The first enemy just plain
can't hit you, and the other ones probably do hit you. You have delayed damage pool 5 or 10 (I forget) and stone power. So that's 10hp/round healed. You've got improved Elan Resistance, so you can pay 1 pp to negate 4 damage. You have Biofeedback for damage reduction. All of this is halved and sent to your psicrystal, by the way. Be sure that you periodically activate a stone of, like, body adjustment, or something, so that your psicrystal doesn't die.
Also you do a decent ability to do the "Lockdown" thing. You've got Iron Guard's Glare, Thicket of Blades, and Crushing Weight of the Mountain (for constrict), and Stand Still. This guy's job is to control the battlefield, get targeted, and take damage so other people don't have to.
Strength of my Enemy is also cool, because the more you grapple, the lower your enemy's strength gets.
Cool trick # 1: Psycarnum Infusion + Azure Talent = free power points, during any time you have downtime. You get 8 power points for expending your psionic focus (10 with improved essentia capacity), which you use to manifest your all-day buffs.
Edits to hack in to this character: replace some of the Illithid grapple feats with, say, Scorpion's Grasp. This lowers the HP a bit, due to loss of psionic feats to power psionic body, but you'll overall have a better damage output due to gaining improved grab, meaning you can dish damage with the claws and begin the grapple in the same action. Superior Unarmed Strike is not necessary, because you have constrict for 2d6 (this really should increase by size, check with DM), +1 1/2 Strength Bonus.
I dunno what you'd wanna gestalt this guy with. An option would be to move the ToB all to one side, giving you full BAB, full initiator progression, and all that jazz. If you go with that, you may actually be better off with Wilder or Psion on one side, because you get full manifesting to dump more into your Elan Resiliance, but the problem is that a lot of powers are Psiwar exclusive. PsiWar//Crusader/Warblade could work. Maybe add in a level of monk onto your psiwar and go Tashalatora.