I have an Edge 705. and for music (yes, I know) I use a ipod shuffle. My next device will have the following

- All the current 705 features
- 4G updates to designated social network sites ie. Facebook etc
- Ability to send emergency sattelite calls in remote areas where there is no cell
coverage.
- Not a cell phone as I prefer to keep separate

I know such a device doesn't exist yet, so I 'll keep using my 705, or downgrade to a 500 if it ever breaks down, but at the way technology is moving, I may get my dream device.