I'm still a big fan of FM transmitters because I can turn any radio into external speakers (ie. in the garage, camping, etc).
Also, my car is noisy enough that anything above AM sound quality is fine
The belkin tunecast is the best I've found so far:
http://www.futureshop.ca/en-CA/produ...3e55defe31en02
So I'm not recommending an FM transmitter as a first choice, but if you do want one, that one works acceptably (and I've had some terrible ones by comparison)