If you're up for a hammerhead flash then look at a Metz 45 CL-4 with PC sync cable.
You get 360deg swivel, 90deg bounce (with separate fill flash), flash autoexposure, fast cycling, decent power - and it makes a pretty effective melee weapon should your model object to your directing style.
They're also dirt cheap, which leaves you extra pennies for post-shoot beers.