As a cheaper and simpler alternative to a parrot, I can recommend the Supertooth Visor Voice which costs £44.99 from Amazon.
This clips on my sunvisor using a magnetic clip so is easy to move from car to car. The bluetooth connection and phonebook synch processes are very straightforward, voice recognition works well.
The single disadvantage is that it does not connect to the audio system so there is no muting facility and you could miss a call if you don't hear it above the music! This has never happened to me despite playing my bose system at fairly high levels.