Playing with the guitar positioned at that angle sitting or standing eliminated my carpal tunnel symptoms, but I look like a nerd with my guitar or bass strapped that high. But I don't care about looks, I only care about playing.
I've been using this one from Staples for a few years now. Flip the arms back when playing guitar. Bring them back down for mixing or general computer use.
http://www.staples.com/Staples-Torrent-Bonded-Leather-Managers-Chair-Black/product_923571
The chair looks like it's putting its hands up in surprise!
DX-749 Height Adjustable Musicians Stool
So I'm a fat guy...
I tried every chair out there... even a big and tall chair rated for 100lbs more than me... (I knew it wouldn't last- got the 3 year extended warranty- the wheels broke off in 2 months)
So... not that I have chronic back issues or anything but sitting in a studio chair sucks for long periods of time-
I didn't have much money at the time- but it cost me a lot of money and time because my studio wasn't ergonomic enough to put in the time I needed to work in it.
I found a used dealer and got a fully loaded Herman Miller Aeron for $350 (keep in mind you can make a $500 aeron or a $1500 one- arm rests and all sorts of bells and whistles can really get these up there).
It was A LOT of money at the time and still is now- but it's well worth it.
I picked up at auctions 3 more Aeron's for the house- for much much much less than I paid for the first one
I have some better stuff now- but for a while i'd joke that the chair was the most expensive thing in my studio
But I can't live or work without them.
It really pays for itself
I have a leather office chair from either Staples or Office Depot (I forget which) that has arms that swing up out of the way when not needed. Similar to this, but black:
http://www.officedepot.com/a/products/476279/Realspace-Ampresso-Big-Tall-Bonded-Leather/
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This motivates me into being efficient with my practice time.