It depends on who's available on the WW in your league. If there are other closers available, or you have one on your bench, do it. If not, then wait until you get a deal involving another closer...but berroa's hurt now (migraines, 15 day DL), so you kinda need to take action fast.
Seeing as the Braves have won 12 division titles in a row, does that mean that soon they are going to have to start making columns as well???