Light Meter (Flash and Ambient) ---- Sekonic
Tripod ---- Manfrotto
Flash that can bounce and swivel ---- Metz/Vivitar
Light Stands, Umbrellas
Reflectors
Radio Trigger ---- Elinchrom El-Skyport
Id agree with the above but if im just walking around town taking photos or on a trip, skip the stand umbrellas and reflectors. Also id include a uv filter and a polorizing(sp?) filter, and probably an 80a i believe (blue) filter.
UV filter always live on my camera lenses; tripod if it's not a burden - as there's nothing better to give yourself a lovely crisp shot; lens cleaning cloth; flash; flash mounted light box which folds neatly into my pocket; wide 50mm lens; circular polariser; and of course: spare memory and battery!