I have a SB-800 with the SB-8A battery pack. I am wanting to get 2 SB-600s, so that I can utilize the CLS system. Now, you make me want to go get it even more.

I've been using 2 Yongnuo YN-560's in manual with radio poppers lately. They are good when you don't have line-of-sight from the camera to the flash, but everyone says that the Nikon CLS is much better if you have line-of-sight.