Speedlight SB-700 vs SB-900

i'm trying to choose between the two flashes... found a fairly comprehensive comparison here: http://photo-tips-online.com/review/nikon-speedlight-sb-700-vs-sb-900/

and here is another review: http://danbaileyphoto.com/blog/comparing-nikon-speedlights-the-sb-700-vs-the-sb-900/

amazon also has a number of good reviews...

i'm fine with the feature set of SB-700. my main concern is power. anyone who used both, is the power of SB-700 enough for typical event type of gigs?

thanks!