Sweet list! Looks like a blast! Maybe throw in a unit if sniperborn in for some at kick?
But we are talking about fun! Not practicality! Since you are going to be going up to 2000 points are you going to be using the doubled FOC? If so id go with six units of scourges, 2 cronos, and 4 taloses(or whatever the plural is) then the duke and as many units of five wracks with liquifiers in venoms that you can get. Reserve all of your scourges and half of your wracks and deep strike them both like there is no tomorrow while marching your MCs into their face. Haywire the tanks and liquidate the infantry.
Someone will be weeping by the end of the game while someone else will be laughing their face off, and isn't that the important thing?