Nokia N91 bluetooth headset question

I just bought a Nokia N91 and have a couple of questions.
1. Is it or is it not able to do Bluetooth stereo? The nokia website is no help.
2. Do I have to use only the headsets listed on the n91 accessories page? and if not,
3. what headsets will work with the N91 and
4. what is the best one?(QUALITY, not QUANTITY of features)
Oh yeah, I'd like one that is BETTER sounding in the car on the highway than others. That is a big thing for me.
Thanks for any advice!

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