Here's my ridiculous idea for 2k:
Grand master with a psycannon, psychic hood and holocaust
3 x 8 Grey knights w/2 psycannons
2 x dreadnoughts with las/
ml/extra armor
2 x armored fist squads with auto/
plas and a chimera with two heavy flamers and smoke/extra armor
1 x 6 inquisitorial stormtroopers with two plasmaguns
2 x 10 roughrides with hunting lances, veteran sarge with hunting lance
----------------------------
Concept:
Plop your grey knights down and hoof it in cover. Advance while shooting.
Put your dreadnoughts in defensible shooting positions.
Stick your chimeras somewhere, used as mobile bunkers for the roughriders if need be.
Rush your chimeras right at them or save them as anti-ork missiles, depending.
Put your armored fist guys somewhere to shoot at tanks/whatever.
Do something with the roughriders, preferably at least earning their points back