Soulspaz im going the same route as you.
So far I got the screen, and the mk4 and the disc. total $700 usd
Now heres where I need help. Does an 06 bmw X5 need a separate gps antenna module. I have the bmw assistance button for my bluetoth. I seen some posts where people say yes and some say no.
Im going to buy an oem harness not the retrofit because im adding dsp to the x5 as well.
So next question How do you tell which bm53 radio I need.
I currently have aux input and BMW OEM DVD headrests. So I will have to reorder the aux connector I think. good bye old MID and cd player..

__________________
E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up