Buddy, it's much cheaper without CLS. 
The cheapest CLS configuration I can think off that will achieve
the same results as the picture you saw is 2 SB600s+On-camera
flash=$380+$380=$760. (not conting camera body)
My little set up there-$120.
To be honest, CLS is useful for only small areas. If I am covering
events, CLS is not of much use, I'd just dump studio strobes
everywhere instead. And to set up CLS is a pain in the arse. I find
that setting up my manual flashes is faster than CLS, believe it or
not. CLS is only useful for photographers who are not used to
manipulating light, OR for non-static subjects. (I consider a
speaker at the podium to be a static subject)
So you can say I have my manual slave flashes and my strobes.
