Struggling to figure out the best 500pt army (from the minis I have)

From the below, I feel like I'm built well for 1k+ games - but my friend only has a 500, and he wants to play a 500v500

As such, any advice on using the below packs/boxes:

-ahriman (on foot) -3x exalted sorcerer -sorc in terminator armour -2x rubric marines packs -1x SOT pack -2x vortex beasts