I am trying to find the correct model DICE for my vehicle but getting a little confused.

I have the 06 X5 e53 - it has CD changer in the rear which I understand it needs to be disconnected and plugs used for DICE system
I have the NAV system, no DSP, no digital radio etc - Ipod is a Nano 8gb (latest model)
I dont need any bluetooth capability as I already have the BMW bluetooth for my phone.
I also have the BMW factory Ipod system which wont charge the latest Ipods hence wanting to upgrade.
Can anyone help with the model/specs etc of the DICE module I need to order?
Lots of them on Ebay but as Im in Aus and they are all overseas I want to be sure I get the correct one and dont really want to pay for all the extra's that I will never need.

Cheers

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X5 4.4i 2006 sports package, Titanium silver, Sports exhaust with Xpipe, Limo tint, 20" wheels 168's (Black), 25mm H&R wheel spacers& arch flares all round - Loud........

Work in progress -:
Replace BMW Ipod system with DICE - installed but no sound yet??