I'm blatantly pulling a riff on Strange Dude's list - he's already pretty close to optimal and at this stage it's just a matter of degrees and preference;
1 Haemon (naked)
3 Wracks in Venom w. S.Cannon upgrade
5 Warriors w. Blaster in Venom w. S.Cannon upgrade
Ravager w. FF
Ravager w. FF
Basically, I believe that at 500 points shooting is much more important than assaulting, so the assault elements can be minimized, the Haem and Wracks are functional enough I can assault with them if I need to, but I'd rather dance around on the edges, use my 7 darklight weapons to shred all my opponent's armor, and than pour poison shots into him till he cries for mommy. I also think FF on the Ravagers is pretty important to ward off any initial missiles or lascannons, et al that the opponent invested in. Alpha strike is great, but there's still a decent chance you end up going second and you want to make sure you last through that impact. The Blaster is there for added anti-mech oomph and to help guard against a two point failure system against armor if my Ravagers go down.