Yeah, i kinda had the same deilema. I was lucky enough to land Bernard Pollard reflectively late, and didnt worry about my db2 as much.
I was wondering the same thing about Chung, he is a popular sleeper. Pats unoffical depth chart has him listed as a backup still??? http://www.patriots.com/depthchart.cfm
CBS has him starting though http://fantasynews.cbssports.com/fantasyfootball/teams/page/NE/new-england-patriots
I guess we'll find out week 1
I also got my eyes on Sean Jones, starting TB SS
Earl Thomas is catching my eye too. we'll see