Plantronics Voyager 510S Bluetooth® Headset

WindSmart provides wind-noise reduction technology, noise-cancelling microphone, 33-foot range, switch between cell phone and your landline wirelessly
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Cost: $229.99 with RadioShack, $299.95 on Plantronics website
BlueAnt® Z9 Dual-Mic Bluetooth® Headset with Voice Isolation
This is the one I have. It's tiny but you don't have to shout for the other party to hear you. It has some quick and easy buttons and it has a lot of features. The sound quality is excellent on both ends. It comes with a wire to hook it up to the net for updates. The best part? I can use it for a couple days without having to charge it! NOTE: It differs from their other similar headset. Make sure it's the voice isolation set.
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Cost: $89.99 with RadioShack
Motorola Wireless Headset H375 for Bluetooth-Enabled Cell Phones

Comfortable fit, button dedicated to on/off, compatible with most Bluetooth-enabled phones, good headset for cost
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Cost: $44.99 with BestBuy
Jabra - BT2040
You never have to charge it because it runs on AAAA batteries, but many complain that the batteries run out quickly. LOW cost at only 20 bucks.
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Cost: $19.99 with BestBuy