My current choice of rules is Savage Worlds, even for miniatures stuff. I tend to run my miniatures games like a RPG anyway, with me running the "bad guys" and the players running the heroes. I also steal rules from other games liberally. I've taken the Encounter Markers gimmick from .45 Adventures, the Hot Spot gimmick from Ambush Alley, and any other goodies I find along the way. Since I'm controlling one side of the game I can tweak on the fly if it looks too one sided. I know it's not true wargaming, but I like it.