I am using and SB-800 and an SB-900 to get my job done and when they are not powerful enough I use the Alienbee 1600.
I photograph many luxury condos with direct ocean view so for me the the interior light needs to balance the intense exterior light (Miami).
Do you know of any light which is more powerful then the SB-900 but more portable then the Alienbee? I often use the Alienbee with the vagabond Mini powerpack on my shoulder so I don't have to search for outlets but the setup is heavy for me.
The N-Flash also called the NiceFoto is fairly popular with real estate photographers because of it is powerful and portable. Here is some info on the N-Flash:
Anyone have any other suggestions for Zoltan?