Why do you need IW? You have dispersion field 
Dispersion Bubble gives protection against immobs (and def to all dmg types), IW doesn't. IW gives protection against sleep, confuse and fear, DB doesn't. An why would you not want Mag 20 protection vs holds and stuns???
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
I can only say don't get into Mental Blast, it doesn't worth it. I had it on Psy-knight but respeced out and put IW in instead. You can think about Psionic Tornado instead. After Total Domination you can hit helpless enemies for double damage. 
If you planning to solo too much get Mesmerize earlier. One hit boss sleep is a nice effect. Also i change Total Domination with Mass Hypnosis. MH + Terrify makes a nice combo. Total Domination also nice but has too long recharge time. Even with AM + Hasten combo it didn't up as i want it to be so changed it with EM Pulse on respec.
And Okton is right about Dispersion Bubble. I hate that sleep effect (but love it to death on Psy-knight). IW and Dispersion Bubble will be a good combo.
also IW gives u a very strong def against psi damg at 17% i think for 90 secs, and thts good, plus a rare power for psi deff
Hi guys - distinctly unfamiliar with Mind - think this build comes quite close to Perma IW though
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Hero Plan by Mids' Hero Designer 1.20
http://www.honourableunited.org.uk/mhd.php
Level 50 Magic Controller
Primary Power Set: Mind Control
Secondary Power Set: Force Field
Power Pool: Speed
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Medicine
Ancillary Pool: Psionic Mastery
Hero Profile:
Level 1: Levitate -- Decim-Acc/Dmg:40(A), Decim-Dmg/EndRdx:40(9), Decim-Dmg/Rchg:40(9), Decim-Acc/EndRdx/Rchg:40(15), Dev'n-Hold%:53(17), Decim-Acc/Dmg/Rchg:40(17)
Level 1: Personal Force Field -- LkGmblr-Rchg+:53(A), Krma-ResKB:30(3), RechRdx-I:50(3)
Level 2: Dominate -- Entrpc-Acc/Dmg:35(A), Entrpc-Heal%:35(5), Entrpc-Dmg/EndRdx:35(5), Entrpc-Dmg/Rchg:35(11), Entrpc-Dmg/EndRdx/Rchg:35(11), Hold-I:50(15)
Level 4: Deflection Shield -- LkGmblr-Rchg+:53(A), DefBuff-I:50(34), DefBuff-I:50(48)
Level 6: Hasten -- RechRdx-I:50(A), RechRdx-I:50(7), RechRdx-I:50(7)
Level 8: Hurdle -- Jump-I:50(A)
Level 10: Insulation Shield -- LkGmblr-Rchg+:53(A), DefBuff-I:50(36)
Level 12: Confuse -- Mlais-Dam%:50(A), Mlais-EndRdx/Conf:50(13), Mlais-Acc/EndRdx:50(13), Mlais-Acc/Rchg:53(36), Mlais-Conf/Rng:53(36)
Level 14: Super Speed -- Clrty-Stlth:53(A), EndRdx-I:50(46)
Level 16: Health -- Heal-I:50(A)
Level 18: Total Domination -- Acc-I:50(A), Acc-I:50(19), Hold-I:50(19), Hold-I:50(37), RechRdx-I:50(37)
Level 20: Stamina -- EndMod-I:50(A), EndMod-I:50(21), EndMod-I:50(21)
Level 22: Dispersion Bubble -- LkGmblr-Rchg+:53(A), Ksmt-Def/EndRdx:30(23), Ksmt-Def/Rchg:30(23), Ksmt-ToHit+:30(39), Ksmt-EndRdx/Rchg:30(46), Ksmt-Def/EndRdx/Rchg:30(46)
Level 24: Telekinesis -- EndRdx-I:50(A), EndRdx-I:50(25), EndRdx-I:50(25), RechRdx-I:50(27), RechRdx-I:50(27), RechRdx-I:50(29)
Level 26: Terrify -- Abys-Acc/Rchg:50(A), Abys-Dam%:50(29), Abys-EndRdx/Fear:50(31), Abys-Acc/EndRdx:50(31), Abys-Fear/Rng:50(31), Dmg-I:50(37)
Level 28: Mesmerize -- Decim-Dmg/EndRdx:40(A), Decim-Acc/Dmg:40(39), Decim-Acc/EndRdx/Rchg:40(40), Decim-Dmg/Rchg:40(40), Decim-Acc/Dmg/Rchg:40(40), Entrpc-Heal%:35(43)
Level 30: Combat Jumping -- LkGmblr-Def/Rchg:53(A)
Level 32: Mass Confusion -- Mlais-Dam%:50(A), Mlais-Acc/Rchg:50(33), Mlais-Acc/Conf/Rchg:50(33), Mlais-Acc/EndRdx:50(33), Mlais-EndRdx/Conf:50(34), Mlais-Conf/Rng:50(34)
Level 35: Aid Other -- IntRdx-I:50(A)
Level 38: Force Bubble -- EndRdx-I:50(A), EndRdx-I:50(39)
Level 41: Indomitable Will -- LkGmblr-Rchg+:53(A), RechRdx-I:50(42), RechRdx-I:50(42), RechRdx-I:50(42), RechRdx-I:50(43), RechRdx-I:50(43)
Level 44: Aid Self -- Dct'dW-Heal:53(A), Dct'dW-Rchg:53(45), Dct'dW-Heal/EndRdx:53(45), Dct'dW-Heal/Rchg:53(45), Dct'dW-Heal/EndRdx/Rchg:53(48)
Level 47: Mental Blast -- Decim-Build%:40(A), Decim-Acc/Dmg:40(48), Decim-Dmg/Rchg:40(50), Decim-Dmg/EndRdx:40(50), Decim-Acc/Dmg/Rchg:40(50)
Level 49: Resuscitate -- RechRdx-I:50(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Containment
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