www.oqo.com
I ordered mine and will have it next week sometime. I've read mixed
reviews, so I'm cautiously optimistic. As for your specific needs, it
sounds like you're a trailblazer in many respects. I doubt they've
tested any of your configurations, except maybe a bluetooth-phone
connection for internet access.
But, don't expect reliable 60kbps speeds when you're using bluetooth
to get the signal between your phone and the computer. You're speeds
will be better when you tether with a USB cable. And, consider
getting an EDGE phone where the data speeds are much faster, in
general.
Your VoIP is a great idea, but unfortunately I don't think we're there
yet for your application. The UMTS network that AT&T(now Cingular)
has rolled out in some select markets may be the key to that kind of
mobile/wireless activity.