Yeah I guess everyone has an iPhone or an iPod (not)....in their eyes at least. I prefer my Android gear, would be nice to have had a choice but at least the link above answers the cable / socket / dock question and shows only the dock main housing needs to come out, not the whole glovebox or stereo. I have to pull my HU anyway as I have to strip out a Parrot system that came with the car. It would be ok, but the remote is missing and Parrot no longer support the system as they've moved onto making Drones....sign of the times eh
There is a BT option for music that works by plugging into the iPod dock which is about £60 it's called Tune2Air or BoVee unit at £100 but thats a bit pricey for what it does. Nice solutions though just plug and play.
I'm still considering an Android head unit for the car and store the original until I eventually change the car, Xtrons are nice but a bit expensive though there are chinese clones around for not a lot of cash. Its a shame the RMT 300 VW unit doesnt fit, it has everything you would want and looks lovely for around £100 however its a slightly different shape to the unique A3 unit.