Here is a better evaluation [Like I am doing with my Space Wolf Synergy Thread]
Psycannon [24”, S7, AP4, Salvo 2/4, Rending]
>Paladins: A good solid choice. With Relentless you will always give you your 24”
RoF-4 Attacks. Can easily be the best choice for dealing with Armor.
>Purifiers: Could be a good choice depending on how you plan on using them. If you plan on bringing aggressive they may not be worth the Points. If you are going to be static, the firepower is hard to beat.
>Terminators: Like the Paladins this make a good default Terminator Weapon.
>Strike Squads: Similar to the Purifiers, I think it depend on the battlefield role.
>Interceptors: These are to mobile to make the best of Psvcannons.
>Purgation Squads: Like the Purifiers, but you only need 5 to pull off 4 Psvcannons.
Psilencer [24”, S4, AP-, Heavy-6, Force]
>Paladins: This is a good choice especially because of the density you can pull off. A full 10 man Squad can pull off 24
ID Shots easily, 30 with the right character. You might as well take them because when you pull off that one casting of Force for your Melee weapons, you get your guns a well.
>Purifiers: Not a great choice, but not a bad one either. It is just odds are you will be making a lot of Snap Shots.
>Terminators: I would take the Psycannon over the Silencer. I would not want to spend the Force for them, even with the Melee Side of it.
>Strike Squads: Like the Terminators, the lack of Psilencer Density combined with the Snap Shots would be my issue.
>Interceptors: Could be good, you will be using force a lot, but like the Strike Squad, the lack of Psilencer Density combined with the Snap Shots would be my issue.
>Purgation Squads: Could be great depending on how mobile you plan on using, but even with that 24 Snap Shots would still be worth it. You could even quickly take out a Flyrant in one Volley.
Incinerators [Template, S6, AP4, Assault-1, Soul Blaze]
>Paladins: I think these would be a waist of their talents. Both the Cannons would be a better choice.
>Purifiers: A Great Choice. With their Nova Power you want to be close anyways. A 18” Pie Plate followed by 4 Flamer Templates should do a number on most things quickly.
>Terminators: not a bad choice, but both Cannons I think will better choices.
>Strike Squads: Not a bad choice, but when compared with the Cannons i9t comes down to their job. If you are going to be an Assault Unit go for the Incinerators. Jack of Trade Unit, Psycannons. Objective Holders the Psilencers.
>Interceptors: I think this should be their Bread and Butter.
>Purgation Squads: If you are planning on using an Allied Drop Pod, I can not think of a better choice.
I think when I am done with my Space Wolf Synergy Thread I will probably do a Grey Knight Synergy Thread.