I can't speak intelligently about the profoto product because I've not worked with it, but I can say that I've worked with just about everything else. I've used both mono and pack systems by broncolor which is a good price and quality comparison to the profoto, or so I hear. I made a choice quite some time ago to go with speedotron's black line of systems after a lot of tinkering with different systems. In my opinion, the important things to look for are color corrected flash tubes, power scalability and the ability to take some abuse. The broncolor and profoto systems seem nice for some extra toys like built in slaves and being able to change the "ready sound" on the packs... OOOOooooo, aaaaahhhhh... :P
In my opinion research the speedotron systems nice and hard. The only advantage to the profoto systems is short burst times to "stop" the motion for fashion shooters. The same thing can be accomplished with the speedotron system by choosing the quad heads though. Happy hunting. Hope this helps.
-Craig
