Technical Support wrote:
A couple of things to point out. I would get PLMs and B800's (Einsteins would be even better) if shooting skateboarding. The B800's will have a shorter flash duration, which will serve to stop action better. Dialing down on most monolights will yeild longer durations, leading to more blur (Einstein and speedlites do not do this, as they incorporate IGBT control for very fast flash durations). If you find 800's too lacking in power, you always have 60 days to return/exchange, or 2 years to upgrade to a B1600.  
Still waiting for my Vagabond Mini and I'm still undecided on what flashes to get. I thought I'd have it figured out by now. Im starting to consider the Einstein but I see they're on back order and do not really want to wait. What are the big differences between the Einstein and the b1600? I didn't know I'd be dealing with blur with the AB's for skateboarding..thats kind of a problem. I need a really short flash duration, so whatever light freezes the fastest is what I should be going for. I have a fisheye so Im usually really close to the skateboarder and they're flying by the lens pretty quick..
Also, any idea how long the wait is for the Einsteins right now? Thanks