CanadaMark
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You really need to go sit in some and see for yourself. If you have any specific issues/injuries to take into consideration, talk to your physio/chiro first to get their thoughts and integrate those into your purchase decision.
I have had $2,000 chairs that I hated and $80 chairs I loved. I've also had professional ergonomic assessments from employers. I personally think the Herman Miller Aeron chair that seems to be 'standard issue' in every office is garbage, as did the ergonomic specialists I've dealt with. It's so bad that it caused me nerve damage that took 6 years to heal by the time I realized it was the chair that actually caused it. The current company I work for had so many complaints they got rid of them all. I've met very few people who like it and I work in an industry where most people unfortunately have that chair, but at the end of the day it's still subjective - I'm sure some like them still.
The biggest things for me are:
1) Rotating arm rests, because rarely are you at a perfect angle to your mouse, and you want to keep that support under your arm.
2) An adjustable seat slider forward/backward - this lets you adjust the point where your lower back contacts the chair without having to compromise how much support is under your thighs, which should go almost to your knees.
3) Height adjustable arm rests (can be mitigated if you have a height adjustable desk). You want your arm close to your body and your elbow close to a 90 degree angle to your mouse.
4) Tilt (pitch) adjustment on the seat. If the chair is pitched too far back it feels like a bucket and puts pressure on your legs, if it's too far forward you feel like the chair is trying to dump you out all the time. You want your knees close to a 90 degree angle to the ground, feet flat on the floor, and not compromising anything else in your position.
Also if you're sitting with good posture, your back is going to be barely touching the chair anyway - you just want to make sure the pressure on your waist/lower back is to your liking and you have ample support under legs. I find most chairs have awful lumbar supports that are usually way too aggressive and with poor adjustment range.
I'd also suggest something with a firm seat - the longer you sit in it, the worse it is for your body to have a really soft seat cushion. This is one reason why luxury touring cars have very firm seats - they are designed to be sat in for long periods of time. Soft cushions are good for a short time, not a long time 
In terms of the more unconventional options, I've tried the kneeling chairs and they hurt my shins, but some people love them. A medicine ball is OK too but not for hours on end, in my opinion, and they are usually too soft for long term use.
Really you should just go to an office supply store and spend an hour or two testing them out for yourself. I used to not care about this sort of thing, and now decades later I am still paying the price for my office/computer ergonomics of years past.
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