The biggest problem with Verizon phones is that "generally" Verizon disables many of the Bluetooth profiles and won't allow you to push your phone book to the car. I have used a LG VX-8000 and a Motorola K1M with fairly good luck on the audio connection, but neither will send the phone book to the car. The connection is stable for the most part and I can get out to pump gas etc. and it will stay connected. Seems to hang on until about 20 to 30 feet and then drops. It does re-connect when I get back into range most all the time with the Motorola, less so with the LG.
The audio on the SC is better than my LX, mainly because of which speaker and the location of the speaker it uses. Otherwise they are the same. You will get a signal strength display from the phone too. That is nice to have.
You may want to check with someone who has a Blackberry or one of the newer smart phones as I have heard that some of them have more of the Bluetooth profiles enabled from Verizon. If that is so, they may let you send the phone book to the car....