Is this the sort of grey knight list we will see on the tournament scene? Input required

So after talking with a fellow first company vet Martin who also happens to be a tournament regular and one of Darren's main targets to flirt with on Thursday night we got talking about nasty Grey Knight armies and this is what he suggested we would see.

Corteaz leading which clearly gives you Henchmen as troops and allows you to re roll your to seize roll and makes your opponent do the same.

3 Psyfleman Ven Dreads

5 5 man Acolyte squads with three melta guns in psybolt Razorbacks
1 8 man death cult assassin squad in a rhino

3 Psyfleman dreads

Comes to 1750 exactly

With that you have 12 vehicles who all will be rarely stunned and shaken
You have 24 twin linked strength 8 shots
You have 15 twin linked strength 6 shots
You have 15 melta gun shots
6 scoring units
and one semi death star unit who have 24 power weapon attacks I 6.

So what do people think, how would that fair at a tournament and how would you deal with it?