I think Mike Jenkins, Orlando Scandrick, Gerald Sensabaugh, Barry Church, and Danny McCray are pretty much locks to return. Mario Butler probably has a good shot too. So that's 5, maybe 6 players, for 8 maybe 9 spots.
3 new players most likely.
Adding Terrell Thomas CB (cheaper than Newman), Tom Zbikowski FS (cheaper or equal to Elam's deal), and Janzen Jackson CB/S (4th or 5th round pick) wouldn't be big splash additions but would really improve the Secondary. Then we could use the bulk of our cap room for a Calais Campbell, Mario Williams, Carl Nicks type.