DB's and Dual Eligibility

I'm in a 10 Team IDP league that plays following positions: DT, DE, DL, LB, LB, CB, S, DB, DP, DP.

Sacks are worth 3, INT at 3, FF's at 2, PD's at 1, with Solo's at 1 and Assists at .5

The following are listed at CB/S:

Bradley Roby DEN
Devin McCourty NE

Roby really intrigues me. There are also several good DB options out there as I need to make a pickup of the best player.

Kenny Vaccaro
DeAngelo Hall
Aaron Williams
Calvin Pryor
William Moore
Malcom Jenkins
Tyvon Branch

I currently have Tyrann Mathieu at CB, Charles Woodson at S, and my DB position is currently empty.

Who do you like best thats currently available?

I think Moore is probably your safest option with Vaccaro having the most upside if you are willing to take on some risk.

I like Vaccaro with the saints bad D taking on injuries ( Lewis and Byrd and losing JR belt beater) ...mores always been a safe guy for decent tackle #s