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http://thebrownpaintbrush.blogspot.com/2011/04/quick-revisit-to-grey-knights.html

I know no one likes links but, honestly it's a good way to get some readership for my blog .

Check it out and please let me know what you think.

I would make some changes to make the list like this

HQ
Coteaz 100

Elites
5 Purifiers- 2 Psy Cannons Demon Hammer 2 halberd 149
Rhino 40

5 Purifiers- 2 Psy Cannons Demon Hammer 2 halberd 149
Rhino 40

Troops
5 Henchmen- 3 melta guns 50
Chimera 55

4 Henchmen- 3 melta guns 46
Chimera 55

5 Grey knights- Psy Cannon MC Demon Hammer 125
Rhino 40

5 Grey knights- Psy Cannon MC Demon Hammer 125
Rhino 40

5 Grey knights- Psy Cannon MC Demon Hammer 125
Rhino 40

5 Grey knights- Psy Cannon MC Demon Hammer 125
Rhino 40

Heavy
Dreadnaught- 2 Twin Linked Auto Cannons Psybolts 135

Dreadnaught- 2 Twin Linked Auto Cannons Psybolts 135

Dreadnaught- 2 Twin Linked Auto Cannons Psybolts 135

1749

Halberds make Purifiers Init 6 so they strike first and can kill off enemy models before they strike.

A few extra henchmen to allocate explosion wounds onto so you don't lose meltas right away are a good idea.

Mastercrafting the Daemonhamer for 5 points is a good investment for rerolls to hit.

Rhinos are better then Psybolt Heavy Bolter Razors when you have grey knights with a psycannon inside. Sure you lose some range and shots on the move but you save points on a heavy bolter and psybolts you don't really need because you already paid for a psycannon for the troops inside you might as well use it and if you get a weapon destroyed on the razorback you will be sorry since it has no fire points. With the point savings you can afford all the upgrades added above.

I dont know about troop strike squads. They are not adding anything of value to a coteaz list.

I would run 3 Purifiers with rhinos, 3 Psy Riflemen, and only coteaz troops.

Compare the following:
165 pts
MC Daemonhammer justicar, 2 attacks
pscyannon with 1 s4 cc attack
3 s4 pw attacks
rhino
175 pts
Psycannon Razorback
3 Deathcult assassians
3 Crusaders

So in comparing the two units, the coteaz unit gets triple the powerweapon s4 attacks, and 3 s3 pw attacks on top. You have a 3++ invuln on 3 guys, and your majority WS is 5, so berzerkers hit on 4+ instead of 3+. 6 init also means your 9 pw attacks swing before most units, and at the same time as halberd PAGK.
Shooting sees you trade a single PAGK psycannon for a twinlinked psycannon, so double the shots on the move and rerolls.
The only thing you lose is 4 stormbolters on the troops and 1 stormbolter on the rhino. I dont really think 10 stormbolter shots are all that great in this metagame, so to me their loss doesnt matter.