What's the best chair for someone who keeps changing positions all day?

Hi all. I have ADHD, so sitting normally for any decent amount of time just doesn't happen for me. I just started a new job and they're giving me a $600 to $800 home office budget. Pretty solid timing since my current chair is completely shot and I need a replacement. I know used chairs are a great deal, but I'm kind of a germaphobe and would rather buy new.

Ideally I want armrests that move up and down, forward and back, side to side, and at an angle. Since I shift positions constantly, being able to angle the armrests when I'm sitting cross legged is huge for me. Adjustable lumbar would be nice too. Fixed back support usually ends up hitting me in the wrong spot.

Any good recommendations for chairs that work well if you sit in weird positions? I'm trying to make a list of options to test out in person, or at least order from somewhere with a decent policy. Appreciate any ideas!