I am new to the Crossfire and this forum-- like a good little newbie, I have been diligently scouring the forum for info that will help me decide on what Blaupunkt head to buy to replace the factory unit. It is down to the Melbourne and the St Louis. I am looking for feedback from anyone who has either of these installed-- especially around sound quality, performance of the SD card reader and ease of use. Thanks for your help.