Hey again Steve, lets try to make things a bit easier for you.
We have a 2011 Audi 2,0tdi sport, it has active rear speakers, you will need to know if yours has this as if you do, and you don't buy the wires to connect, then you won't have working rear speakers. To find this out play your stereo, open your boot, and see if there is a sub playing on the passenger side, if its hard to hear put your hand on the boot lining and if its vibrating then you'll need additional wires.
We fitted this one, but got it from Ebay as Maps were included: http://xtrons.co.uk/px71aa3-7-inch-touch-screen-dvd-player-with-gps-navigation-dual-channel-canbus-for-audi-a3-s3.html
It was simple, no programming necessary and was a straight swap.
Ours is a single canbus version so we lost the radio information from the dash, although you can get some now which don't have this issue:
http://www.ebay.co.uk/itm/Head-Unit-XTRONS-7-Digital-Screen-Car-CD-DVD-Player-Stereo-GPS-Sat-Nav-Audi-A3-/331347915823?hash=item4d25dff42f
It plays CD's, Radio, DVD, SD Card - connects via Bluetooth - it also works with the center column AUX input.
It works with the phone well & the GPS is pretty handy.
With EQ you can play around with the sound to get it how you want it.
it is a simple fit, take the old one out and plug in the new one, however if you have active rear speakers you'll also need to have the adapter, just can't remember which one from the top of my head. Need any other info just shout.
