Peaceful tournament: help me pick the worst chaos knight units?

Hi guys,

I will be joining a small event, a peaceful 750pts tournament, where players are supposed to come with semi optimized lists - or any list they want. The amount of optimization should stay moderate.

I absolutely want to come with my newly converted and painted CK army, but I don't want to be "that guy" bringing a gun to a knife fight.

Hence I was tinkering: what units would be the less optimized to take, and at the same time still fun to face for both players?

I was thinking that an army of wardog moirax may be a good idea. One with graviton pulsar, siege claw and 1 rad cleanser is expensive and not really good for its price. What do you think?