Silver

I know this thread isn't about heroic groups, but for MMC I like to go with Wizard(me), SK, Templar, Fury/Shaman, Swashbuckler, Dirge/Coercer.
Usually a dirge because I'm a greedy bastard and like to be the only mage in group when the rare stuff drops .

Iskiab

Guard
Defiler
Templar
Dirge
Coercer
SK

Deludar

Zerker
Dirge
Inq/Temp
Defiler
Warden
Coercer/Assassin

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Xanoth

Shadowknight
Fury
Coercer
Dirge
Templar
Defiler

:D

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Grevious

When we got enough healage always this for me and I love it

Guard(me)
Cleric (preferably Temp)
Defiler
Warden
Dirge
Assassin

Raid does over 20k dps lots of fights and I never have aggro issues.