Unless there's nothing better, you're wasting money on Capps by paying for the C6 and using his R1. I'd take Visick's advice and upgrade to an R2. Plenty of quality guys in that price range.
Berkman is definitely a platoon unless you're saving cash. His defense isn't pretty and his lefthand column has decent OB, but is poor otherwise. And since you're thinking of platooning him, you may want to explore better/cheaper platoon options. Hawpe, Griffey, Stairs, Doumit, Nady, Morales, Raburn may fit.
As per catcher. Bowen's cheap for a reason. I wouldn't want any 'w' on your team so Burke's out from the start. If you have the money to spend, out of that group I'd pick Johjima.