Hi there

I must say having poured over the 20+ pages of questions I am amazed at the fantastic amount of knowledge there is here.
Can you guys help a bus pass carrying old guy out who is trying to find his way round using the forums.
I have just bought a Jan 2007 Slk 350 fitted with an APS 50 system no CD multi changer which seems to have phone and bluetooth. I would like to possibly upgrade to the command system with a proper colour screen

Which would be in your opinion the best to go for can I still play music whilst using the Nav?

Which head unit do I need ( 2.5?) is the same unit fitted in other models?
What other parts do I need?
Do I need to have it recoded?
Is there an idiots guide out there on how to do it?
Sorry for all the questions but if I dont ask I will never know.

Many thanks in advance for any help you can give me

Terry