Along with the Parrot EasyDrive, I would also have you look into the Motorola HF820, which is even slicker and smaller. Both are good entry-level hands-free units, but making the right choice will depend on three personal preferences:

1. Do you drive a lot of different cars and value portability? If so, you want a unit such as the Parrot EasyDrive or the Motorola HF820.
2. Do you want something that manages your car stereo during outgoing and incoming calls? If the answer is yes, you want a model such as the Parrot CK3100 or the Motorola IHF1000.
3. Those two things notwithstanding, what's your budget? The self-installed portable devices I mentioned are around $100. The installed kits are around $200, plus maybe that much again in installation fees at a local stereo shop.

Either way, expect to get good call quality unless you drive a noisy sports car or a convertible with the top down. No speakerphone kit I've tried works well in those situations.