Rest of season-A. Smith or M. Cassel?

[JuanOne]

This is for a league where you can start a QB in the flex. Big Ben has been a big disappointment, so from here on out, I'm playing the matchups. Which QB do I pick up for the rest of the year? Alex Smith or Matt Cassel? Andy Dalton, and C. Painter are also available.

Thanks!

[MadDog36]

Andy Dalton