32-bit plugins are handy to keep around, just know that some may work better in a 32-bit install of Sonar.  I always install both 32-bit and 64-bit versions of Sonar, as they happily co-exist on your system.
 
And, sometimes even if they don't work well with BitBridge, there is another bridging piece of software called JBridge, which I think runs around $20, and some folks find some plugs that don't work with BitBridge DO work with JBridge.
 
Bob Bone