I want to be able to shoot full body length shots with even lighting from head to foot, so I want to know if I should get a B400 or B800. Also which soft box should I get? The large (32"x40") or giant(30"x60")? I will use a Vivitar flash and Sunpak flash for fill and background/hairlight for right now, until I can afford an additional AB or two. The room size if it matters is 12'w x 30'L x 10h. I emailed the AB folks yesterday inquiring about this but they haven't gotten back to me yet, and I'm itching to drop the hammer on this now, LOL. I feel like a kid at Christmas.