2012/13 X5 Diesel... what options to get/look for?

[Tominizer]

I'm shopping for a 2012/13 X5 Diesel and wanted to know what options were worth getting when looking for one.

I use to have a 2001 X5 3.0 a loooooong time ago, when to Mini and a Mini Countryman JCW....... but sorely miss the X5. So it's time for the Mini to go. I want back into an X5 and would like the diesel.

I do a lot of DIY, my vehicles usually get modified to various degrees. I'm fairly handy. I just redid the Mini suspension back to stock in around 2 hours. So not afraid of wrenching. I forsee wheels, exhaust, roof rack, and a chip at least with this. I do a lot of driving and comfort is becoming more and more important. Any specific seats in this gen of X5 worth noting ?!?!