Joey Votto's Value?

[JRM4833]

I wasn't huge on him when I got him in a deal during the preseason, but he seems to be having a good year for himself and I notice his stock rising these days. What do people expect from him? In a contract/salary cap league, would you consider trading Votto (who is eligible for a 5 year contract at $2/4/6/8/10 starting when he loses rookie eligibility) for Kelly Johnson in a 3 year contract for $5 ($6/7 next two years)? My current 2Bs are Weeks (2 years @ $13/14) and Kaz (no contract). My current minor league roster includes Ian Stewart, Jeff Niemann, Adam Miller, Reid Brignac, Joey Votto, and Jay Bruce. I lean toward standing pat, but always like a second opinion when it comes to prospects. Any thoughts/advice would be much appreciated.