None of them fit my ear or head properly, or just look goofy when wearing them.

Instead, for the car, I bought a BlueAnt S1 visor speakerphone. It just works. People often tell me later that they couldn't tell I was on a speakerphone.

It is supposed to be voice activated to answer calls, but usually I have the stereo on when calls initially come in, so I think that affects how it responds when I try to answer them that way. It can pair with two Bluetooth phones simultaneously, so you can use it to answer calls from a few people in the vehicle. Has a ton more features as well; check their website if you haven't used one before. I have also had some friends with other Bluetooth speakerphone gadgets check it out and comment how they prefer this one over the older ones they own.