After I entered Div II in Germany I had a team which was pretty competitive on paper, but couldnt stop anybody even if our lives depended on it and commited WAY too many fouls. I had to rebuild and purchased a non-fouling Center with a Team-High ID and SB, and all of a sudden most foul troubles were gone and I easily reachend place 4 and the playoffs. Now in my second season I´m into different troubles, rebuilding again, but I´m a huge fan of at least double digit Blocking on the Center position and 8+ on the PF since. I´d also like to have one guard / sf defender with a combination of OD + ID + SB higher than 30 for special purposes, though I´m not sure how SB affects guard play yet.
I personally believe in SB, because it find it hard to think that BBs would have created a skill that is significantly less important than others.