I'd go with Fitz. He's third in the league in TD passes since week 3 with 19 (Cassel 21, Brees 20), and Minnesota has surrendered 8 TD passes in their last 3. Flacco has a tough matchup and the others just aren't as consistent... Well, Freeman is, but is consistently a few points worse than Fitz.
I actually would prefer San Diego vs Oakland to Pittsburgh @BAL if you have a spot. Oakland had a nice 3 game win streak a little while back, but have seemingly returned to futility and San Diego is money in December.