Hi all

The Explorer 320 from Plantronics is cheap (about USD 50), but sports an
incredible performance. It worked flawlessly with my Nokia 6230, Imate SP3
and Imate PDA2k. Battery duration is exceptional, and you can hook it to a
regular notebook via BT interfaces, so you can use it even with MSN
Messenger. The only drawback is lack of noise supression, in windy
environments you must cover the microphone to get understood by your
counterpart. Perhaps the absence of an LCD screen prevents to be useful with
bigger devices such as the HTC Universal, where a LCD headset is a very good
idea (you can pick up you calls by reading the tiny screen, leaving the
device untouched). This model achieved very good reviews in specialized
magazines, and I can support that perception.

Good luck,

Carlos
MVP .NET CF