Ok, so I am sure that I will be asked this, so here is a run down of parts for a "Basic" trooper:
Plastic High Elf Pheonix Guard "Skirt"
Plastic High Elf White Lion "Boots"
Sanguinery Guard Torso front & back
Various Marine armes with, Chaos Warrior gloves
Sanguinery Guard and plain, with B/Angel 'Wings'
All from the Grey Knight Power Armour Box
Plastic High Elf Pheonix Guard
White Lions with Green Stuff or D/Elf Cold one riders