What defense to start?

Hey im torn on what fantasy football defense to start this week the Panthers, Raiders, Chiefs, Bengals, or texans. Most of these teams are free agents so i can just pick them up, and theres also the seahawks, bucs, jaguars and colts, but i dont think any of them are having great weeks. All of the teams mentioned at the top of the list are decent defenses and hare great matchups this week, but i cant decide whether its smart to keep the raiders versus the broncos, or use one of the other teams. Last time the raiders played the broncos they got 35 points on the road, so its lookin like the smart pick. But the texans are playing a pretty bad titans offense, the panthers are playing the horrid cardinals offense, and the chiefs are playing a shaky but not bad rams offense (however skill wise they probably are the best of these defenses). So who do you guys think i should play? im leaning to the raiders currently.