Some FA CBs to look at...

I feel pretty strongly that Florence ends up as a Saint.
He's the kind of mid-level free agent that we usually target.
On top of that, he roomed with Drew Brees while they played together on the Chargers.

I don't think he'll help though. For fantasy football reasons, I watched the Chargers quite a bit last year (whenever it didn't conflict with the Saints game)... and Florence seems to get picked on a lot. He wasn't getting torched for 1.8 long touchdowns per game like Jason David, but he did seem to give up a lot of short and intermediate catches.

Florence is definitely a nickelback, and personally I feel we already have a pretty good nickelback in Jason Craft. Unfortunately with Trufant and Asomugha off the market, the FA CB market is pretty thin.