Thanks for the reply! I've tried test mounting it there as well, but this mic didn't perform very well there for me. How did you run the wire behind your dash? This part of things is still a bit new to me. Thanks again!
UPDATE: Now have mic on the A pillar. Gently taped the mic to an rca speaker wire puller and fed it through to the floor, then pulled it over and pushed the wire into the weather stripping.
Some pics of the new Pioneer 2400BT head unit. Happy with it so far and you can customize the color to match the Vibe's. The JVC unit went into my wife's Dodge Journey so she could have Bluetooth as well.