OK, for anyone who cares, Sir Prometheus and I did have the clash of the titans battle, after the last round.
I was up all night with Army Builder for this one, and given my projections for the meta I finally settled on this:
Wraithknight 240
Sir Prometheus's list is posted above.
Here's my battle report:
We played Dawn of War deployment. The table had a large rock spire in the middle that was actually tall enough to give a Wraithknight a cover save. I won the roll for first turn and set up dead center as far forward as possible. The riptide set up on the opposite side, leaving the other side empty, a classic "refused flank". I knew I was in for a tough battle.
He tried to sieze and failed.
WRAITHKNIGHT TURN 1
I jump forward 12" behind the rock spire, and shoot 2 wraithcannon shots. 1 wound allocated to the front drone who makes his 4+ invul save.
RIPTIDE TURN 1
He moves 6" to the left, shoots everything at the wraithknight, and fails to do a wound (I made a cover save). Then he scoots another 5-6" towards the corner.
WRAITHKNIGHT TURN 2
I jump the wraithknight out 12" straight towards center of his battle line. Again shoot 2 wraithcannon shots. This time I kill a drone. He passes his morale test (running off the board would have been the most humiliating way to die).
RIPTIDE TURN 2
He moves to the left, Nova charges to give himself a 3+ invul save, and fires. The wraitknight is no longer in cover and takes a wound (down to 5). He then scoots over to the left again, but he's out of room to escape and has to start making a run up the short table edge.
WRAITHKNIGHT TURN 3
The riptide is out of room on the left, so I jump over right in front of it. Fire the wraithcannons, and kill the remaining drone. He again passes morale. Then I charge. His overwatch fails to Wound (t8 is a bitch). Wraithknight strikes first, with 5 str 10 attacks, hitting on 3's. Riptide has the 3+ invul save and doesn't take a wound, and actually does a wound in return.
RIPTIDE TURN 3
Riptide attempts to Nova charge for the 3+ invul save. He fails it, taking a wound (down to 4). I think I heard the pilot say "Ruh roh" over the speaker system. Combat arrives, the wraithknight does 1 wound to him, and he smashes back for 2 str 10 attacks at the Wraithknight, hitting on 4's, but fails to do a wound.
WRAITHKNIGHT TURN 4
The wraithknight deals 2 wounds to the Riptide in assault, and the riptide does 1 back. Riptide loses by 1, and fails his morale test this time. Since the wraithknight outclasses the riptide's initiative by 5, he easily executes the sweeping advance. Game over.