I`m getting the SFII tomorrow, ordered a day or so ago from Orange. In readiness I bought the Sony MW600 Bluetooth which has the hands free on the unit, a built in radio and a set of slim in ear Sony earphones plugged into a standard 3.5mm port. The real beauty is the port accepts any earphones with a 3.5mm audio jack plug. The unit has A2DP streaming which I believe the SF and SFII uses.
The other advantage for me is it can be used with my other phones and/or just on its own as a radio. Its a very short length of wire to the unit and then Bluetooth all the way to your phone with a built in clip. Only bad thing apart from the shortness is one side is a longer wire than the other, but you can use your own. Once Bluetooth is set up it controls most music players too with start/stop music, forward,reverse, next track, previous track. Controls for swapping playback device (radio/music player) and the up/down volume slider are a little tricky but not too bad.
Watch Maplin, brilliant store but they go wild with their prices. I got the MW600 from Play.com for