Using a setup capable of TTL speedlights allows me more control than any setup you guys are offering.
I've done two (or two-and-a-half) speedlights on Nikon TTL, using SB26's and SU-4s. It works well, but it's not radio-wireless (i.e. the flashes have to see each other.) And while it's fine on a Nikon TTL body, I can't use it with medium format or my manual 35mm bodies.