Congratulations and welcome! Looks great!

I went with Eibach sway bars, made a huge difference. I kept the rear air and went with H&R lowering kit not adjustable like coilovers but might want to look into that. I set the wheels out with 17 MM spacers which improved handling and the wheelwells look fuller. Many years ago I went with BSW speakers, amp and sub. I chose a media-bridge to get USB, Bluetooth, Sat, and Aux. The aftermarket NAV options, like Dynavin, out there now are a more expensive but have more features and use current technology. . Changing out the inside lights to LEDS is an easy and inexpensive upgrade. Many have used a particular vendor that fixes the pixel issue. I think it is under $100, someone will need to chime in on that, don't know the name. There is an electric fan thread that is very current that may be helpful. You can see some of what I have done in my album.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas