New to BMW & X5

[bd3500]

Hello, I just traded in my Saab 9-3 on Thursday for an X5. I'm very excited.

I have been reading all of the how to articles on the main page, but I have a couple questions.

My 02 X5 has a regular radio (no DSP) and a single CD player.

I would like to put in "retrofit" navigation with DSP, bluetooth enable for my cell, stick in a 6disc changer in the back, and also add sirius.

I currently have a Sirius plug and play model in there, but I want OEM.

A couple questions:

1.) I see a lot of Nav units on ebay (MKIII and MKIV, also 16:9 screens). Is there a compatibility issue between MKIII and 16:9 screens?

2.) I believe my car does not have High OBC, how can I tell?

3.) Where is the best place to go buy parts?

4.) Any rough estimate on how much this is going to cost me if I do the install myself? Again, would like Nav w/ DSP, Sirius, and 6 disc cd changer

Thanks in advance for any help anyone can provide.

Best,

- B