The Nuvi 765 is nice w BT if you want to hear T/T directs or have your phone mapped thru it for all-in-one BT connectivity.
The phone part is not true. Won't work. It'll bluetooth to the phone, but it will not send the call to the headset. It will only use the internal speaker and mic. It will send GPS voice prompts and music to the headset though. The 765t can get kind of buggy with MP3's though. Mine would lock up fairly regularly, and if you have a lot of songs on the SD card the thing takes forever to boot up, as it will scan the entire SD card before it will be ready to navigate. I lasted about 2 or 3 months with the Nuvi, then I ended up getting a Zumo 665. As a GPS the Nuvi works fine, but I wouldn't use it for MP3's.