Alien Bees vs. While Lighting

I'm thinking of additional lighting options. I got shoe flashes and continuous lights . now thinking of studio strobes: Interfit, Photoflex, Alien Bees or White Lighting.

Now speaking about Paul Buff's equipment, I see WL is more expensive than same powered AB gear. It's probably more versatile, though. So which brand would you or did you give preference and why?
Thanks.