Office chair recommendations?

Looking to get a new chair; something better than my previous chair which was some Chinese product I got off Amazon that I thought might be pretty good, but ended up breaking in less than two years. I've experienced pain problems from chairs, in the legs, and the elbows (from arm rests). Avoiding those problems will be a must from my new chair.

Update: I made a purchase. Details in this comment.

I would take recommendations for either a specific model, or just a brand/manufacturer. Would love to hear stories from people, especially as it relates to sturdiness and longevity.

Desired qualities:

• Around 200-250 USD, but there's wiggle room here. (Update: I'm strongly considering bumping this price range up. It occurred to me: I will be in this thing for longer per day than I am in my bed, and I didn't skimp on my bed.)
• Good ergonomics; good for posture, health; not lead to sitting-related pains, etc.
• good for use 10+ hours a day
• very comfortable seat cushion (not hard, nothing digging into thighs, etc.)
• wheels / casters
• something that would last 3+ years
• 2+ year warranty
• adjustability of at least the seat elevation

Nice to have:

• liftable or removable armrests, because these tend to just hit my desk or other things
• 3+ year warranty
• lots of adjustability, to be able to zero in on the perfect fit for me
• wheels / casters good for carpet, too

So far, I've read good things about the Branch brand, but the model I'm eyeing (the "Branch Ergonomic Chair") is a bit out of my price range (though I've been talking myself into it).