Audio overhaul breakdown

[Lowblock]

Hey guys,

Looking to pick up an 03 E53, No nav has DSP. What are my options for factory installed parts? Was BT available? I would like to add Ipod and Sat radio if available. I have an e39 that has what I believe was the same system and I gutted it to do a complete aftermarket Alpine system. Am I going to have to do the same to this X5? I work for a local mobile audio/video shop and I have installed the Dice, Isimple, etc in other BMW's but not the E53 and they always seemed "clunky" to me and didnt seem to be as "seemless" as they make it sound to be. We dont run accross any factory type installs so I dont know much about it. If I can retain the factory system, gain function of ipod, BT and Sat using factory parts that would be great, if not im not afraid of gutting it and starting over...again.

Thanks
Dave