So, we played a couple of 750 points games on Thursday. Now, before I found out that there were certain restrictions on the lists I put together the following:
Rune Priest, Chooser of the Slain, Living Lightning, Tempest's Wrath
5 Grey Hunters, Plasma Gun, Rhino
5 Grey Hunters, Meltagun, Razorback, Lascannon/Twin Linked Plasma Gun
5 Grey Hunters, Razorback, Lascannon/Twin Linked Plasma Gun
6 Long Fangs, 5 Rocket Launchers, Razorback, Lascannon/Twin Linked Plasma Gun
Again it suffers from being a cut down version of my bigger lists and it might have suffered just as badly against Andy's horde but I think as far as optimisation goes you can't do much better than this at 750...