CES 2005

Now that I have had my Samsung a930 phone for a couple months, I am ready to get a Bluetooth headset. This is real new to me. A couple months ago, some forum users said some sets were incompatible with this phone. Any recommendations for which Bluetooth works well with this phone? I notice that the prices for Bluetooth sets on ebay run from a few dollars to way over $100. What is a good price point for a headset? Are the cheap ones any good? Thanks.