Warshade hater 
*pokes with stick*
Choose a warshade!!!! Join us!!!!!!
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Depends if you're going strongly into Human Form or not.
If you're not, you can get away with taking far less power picks. You can in theory use Nova for damage and Dwarf for tanking... Merely using Human as a "buffing" form for Hasten and Essence Boost.
Basically, Human form is your "Blapper" with RS and IS. Dwarf is your Tanker. Nova is your "Blaster" (though Human isn't too bad with essentially two nukes plus Solar Flare, Glinting Eye + Gleaming Blast).
Generally, most PBs will be either full Triform or Biform (Human + Dwarf).
Assuming you're going to invest heavilly into Human form? In my opinion...
"Must Haves"
Glinting Eye, Gleaming Blast, Radiant Strike, Build Up, Incandescent Strike, Solar Flare, Dawn Strike, Pulsar. Incandescence, Essence Boost, Reform Essence, Conserve Energy, Quantum Flight, Light Form. Stamina.
"Good to Haves"
Photon Seekers (Your second Nuke, do not treat them as proper pets), Shining Shield (good in theory until you are detoggled). Combat Jumping + Hurdle. Acrobatics. Hasten. Stealth. Super Jump or Super Speed.
"Optionals"
Glowing Touch, Quantum Shield, Thermal Shield, Gleaming Bolt, Group Energy Flight. Other pool powers.
"DO NOT TAKE"
Luminous Detonation (Stupid Knockback, very poor damage).
Note that if you take Dwarf form you can get away with dropping some situational "survivability" powers like Pulsar and even Quantum Flight (though this is VERY useful in certain situations). Unless you splash out on a load of IOs and are very careful with Endred slotting, you'll not want to ever drop Conserve Energy.
Light Form, Essence Boost, Reform Essence, Conserve Energy, Stamina and Build Up are the only PB powers I would rate "essential".
I really should do something about this signature.
I don't think there is any serious must-nots when looking at the many different intentions and teams make ups. I have taken nothing other than PB powers and in the different teams the levels of usefulness vary. If you don't like the sound of it don't take it....unless you do PuGs then Dwarf form and light form are priceless and one would keep kb aoe to a minimum. Also certain powers come under the good to have for events when most people don't have them but are rarely needed. Put mass immobilisers/sonics on your friends list.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
If you're wanting to use Nova/Dwarf form a lot then you don't need any extra travel powers or stamina.
Of the actual PB powers, I haven't found Pulsar to be useful.
The human-form blasts are lame if you take Nova form, though the human melee and PBAOE attacks are very nice indeed.
thanks everyone, my PB's coming along quite nicely - mainly due to you guys pointing out the awesome powers =)
Ive just rolled my first Peacebringer and am a little. . .intimidated by the stupid amounts of powers to choose from. So whats are the 'must-haves' and the 'must-nots' for a peacebringer? (yes i'm quite newby
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