[greenblood]

the first one is Blueant, which cost $99
but T-Mobile also sells Altec Lansing T515, the cheapest price I ever found (except ebay)
check my review on amazon.com
if you're hard core DIYer with good soldering skill, and able to find 2ea 220uF/6V surface mount capacitor, you can modify the headset unit to enhance bass (replace the 68uF with 220uF)
I like this speaker, the sound is pretty good, conjuction with PSP bt adaptor, I can amplify PSP wirelessly

[AndrewD]

sweet

[greenblood]

I really like the 3-in-1 combo
but the mic is not that good (sound weak)
but as long as using as wireless speaker and wireless headphones, you'll like it
of course if you're hard core DIY type, you can do the mod I mentioned above
it can use ipod shuffle 1G battery, means no battery headache