What to fix first?

[CoughinCamel]

Hey guys new to the forum and new to the x5 (well new to any bmw really). I knew it had some issues to start with and this forum helped me decide I could handle them.
I just picked up an 05 e53 4.4i with the 6sp AT about a month ago.

It came standard with the excessive camber in the rear and a bit of a funny idle. (It hovers at 600rpm but stumbles like its going to die but picks right back up.)

Its starting to do the hard shifts from 2-1 and 1-2. (Will have the fluids flushed and seals replaced soon)
Theres a whine coming from the rear as well. (Unsure of where its coming from. Hoping its the worn tire and not the diff.)

Theres a popping(?) sound coming from the front under hard acceleration from a stop but its rare. (Fearing thats splines or TC chains.)

Every so often the 4x4 triangle comes on and stays on, not the trifecta. (I just stop and go full lock both ways twice then shut it down, makes the light go away)

Under hard braking at slow speed there's a shudder(?) In the front suspension or wheels, I can't feel it in the pedal though, so I don't think it's ABS.

So the big question is what do I prioritize first. Cost isnt a big issue as I'll be doing the work myself but could only afford one big repair a month.