New addition to the stable X5 35i

[von540i]

Greetings all,
Just purchase a e70 X5. It's a clean, one owner white on black, well optioned (comfort seats, xenon, panaramic roof, rear seats) with 44k mi on it. Drive great as far as I can tell.

I'm looking for some advice on what maintenance items I should be taking care of now, soon and later on down the road. I'm new to the e70 and n55 but not new to BMWs. I have a few (e36, e28,) and had an e53/6speed that I used for years but unfortunately it was time to move on due to age and mileage (270k).

The battery and water pump were just replaced so that's nice but dealer didn't replace the thermostat, so planning for that soon.

Curious what the recommendations are from those who've had them and know them well. If it were you, what would be on your list of "to do's" to make it as road worthy as possible. I've seen recommendations on transmission fluid and filter replacement every 50k. Seems like a pretty short maintenance interval but maybe not for these e70 Bavarian machines. Belt and tensioner are another item that seems to make the list.

What would you do if it were yours?

Thanks in advance!