Need it to connect to my iPhone for chunes and taking calls.

Is looking favourite at the moment. Any alternatives / advice?

Ta

External microphone is needed to makes calls bearable. I had a mex 3600 thàt was pretty good apart from that.

Mmmm – the 3900 has an external mic option – might be better going for that one then.
Ta

I use a parrot mki9200 and it just connects into any standard car stereo wiring without breaking into the looms. Works well & streams music over either bluetooth or has an ipod connector which you can hide away for betterer control.
Probably only took 2hours max to install in my little Clio start to finish.