But Alex.. Overall setup weight will be one big setback.. Personally tried it nefore i got my SU800 and the extra "pre flash" frm SB900 to trigger the remotes prove to be too much to add to the scene .. Heeeee
Pre-flash: if you use the pop up as commander then it will send out a flash to trigger the external flashes and then only the external flashes are firing. While this all occurs within a very short time (ms) it can be enough to get insects (jumping spiders) to move. Also if you use TTL then the flashes will fire a measuring flash for exposure measurement before they actually fire.
Wow, that good, over there will be alot cheaper.
If you want lightweight, just get a IR panel for built-in flash, and use it as the commander for the 2 SBR-200.