Oh, my speciality. Monk based psionic gishes.
First of all, what kind of power level are you looking for? If you're familiar with the tier system, that will do, or a short description of the party you're in. This is so I know if you want be running around and punching things for double greatsword damage, or if you want to be on fire with holy light shining out of your eyes punching things into orbit while screaming.
Secondly, what does your DM think the granted power of the Magic Mantle does? Does it let your ML = CL and your powers = spells? Because that changes your ballgame slightly in terms of what you can do and how easily.
Without even taking that into account.
You are a Spell To Power Erudite. No questions asked. I'm tempted to tell you to burn your bonus psycrystal feat as well, and be a Mantled Erudite on top of that. There is no debating that 3pp cheaper Astral Constructs are sexy, and you're already feat-starved. But delaying your erudite casting progression by even one level is heinously painful. I guess if you're going to spend combat turns creating astral constructs and entangling ectoplasm and ectoplasmic walls, then go Ardent 1. If not, go Mantled Erudite.
Also, why in the name of shit-christ are you going Metamind? There are other ways to recharge your pp, even in realtime, and 5 lost caster levels over 10 levels in a PrC is more painful than being kicked in the dick by god. Even if your GM bans pp-recharge (why is he letting font of power work if so?), all you need to do is get to 7th level powers, and then you can spend your downtime creating Soul Crystals (MoI) and covering them in quintessence. Go Slayer, or if your GM is reading the Magic Mantle as '=', go Mindbender 1 (for Mindsight) / something else. Chronorebel is a fantastic full manifesting PrC for psigishes, from 3rd party but widely respected 3.5 sourcebook 'Hyperconsciousness' from Dreamscarred Press(i'll send you the class if you're too out of pocket to pick up the pdf at the moment).
See if you can get Monastic Training dropped from the prereqs of Tashalatora, as it's the most useless bullshit prereq feat...
Overchannel and Talented are nice, especially at this level where nearly everything you know is 3rd level or lower. But I still view them as strictly optional feats. I'd probably invest in Snap Kick, Extend/Persist, or INA before them. Don't forget, your psycrystal gets feats. One should be Hidden Talent so it can do things like receive power points and psionically focus itself, but all the rest can be used as a feat bank for you, via Feat Leech. Oh, and you don't have psionic meditation. Psionic meditation, +hustle, +linked power, lets you buff in combat, using hustle's move action to regain the focus you blew using linked power.
One thing you should probably look into is Incantatrix or Spelldancer and the Persist Spell feat. Because your powers are spells, etc etc. Psigishes can actually stand to buff in combat, thanks to Linked Power and later on things like Temporal Acceleration, Schism, and Control Body+Solicit Psycrystal.
A good way to fix your sucky BAB is to pick up Arcane Disciple: Something With Divine Power. There's one that has both Divine Power and Righteous Might, if you can believe it.
Oh, and i'm hoping you're a Kalashtar? Quori Ectoplasmic Fist shards and Quori Link shards are utterly fucking terrifying in the hands of a monk psigish, and the extra pp aren't bad at all.
In any case, here's a short list of useful spells and powers for a monk psigish.
HAND TO HIND COMBAT:
OFFENSE
1st
Prescience (Offensive, Defensive)
Expansion
Bite Of The Wolf
Hammer (stacks with unarmed strike)
2nd
Strength Of My Enemy
Psionic Lion's Charge
Feat Leech
Painful Strike
Wraithstrike
Blood Wind
Improvisation
3rd
Mighty Whallop (and later, the Greater version, which kicks way more ass especially combined with other size-increasers)
Heroism
Physical Acceleration
DEFENSE
1st
Vigor
Inertial Armour
Force Screen
Prescience (Defensive)
Thicken Skin
2nd
Share Pain
Energy Adaptation, Specified
Concealing Amorpha
Detect Hostile Intent
3rd
Heart Of Water
Spiderskin
Mirror Image
Evade Burst
Alter Self
OTHER GENERICALLY USEFUL POWERS
1st
Entangling Ectoplasm
Grease, Psionic
Dimension Hop (CPsi)
2nd
Ego Whip
Astral Construct
Psionic Charm
Solicit Psycrystal
Wall Walker
Body Equilibrium
Psychoportive Shelter
3rd
Ray Of Stupidity
Energy Wall
Telekinetic Force
Telekinetic Thrust
Time Hop
Psionic Suggestion
Wings Of Cover
Touchsight
Read Thoughts
All listed at the level you learn them as (discipline powers and spells one level higher than their non erudite equivalents).
There's lots of other stuff, some of it more cheesier than others. Metamorphosis is obviously insanely good, just like Polymorph. A great buff spell is Necromantic Empowerment, although you need to find someone with the Mother Cyst feat to learn it from. A great combo is Control Body (yourself) + Solicit Psycrystal. So your Psycrystal maneuvers you around while you cast spells or whatnot, and you get to use your int instead of your dex and str for your AC, to hit, and damage. The Bite Of The X line are very good, as well, and Bite Of The Werewolf comes online as a 5th level spell for you. If you're planning to cast as well as fight, all the stuff in the psion handbook still applies, except probably 'how to do damage', as the damage you deliver, you deliver WITH YOUR FISTS OF JUSTICE! And ofc the basic combo of vigor/share pain remains valid, although when Necromantic Empowerment comes online, it becomes that + share pain instead, because 100 THP is more than vigor gives and for a lot cheaper too.