In the same way as if you were to work in an office, your studio will be a place where you will likely spend many hours. It is for that reason that you should not exactly go cheap when it comes to selecting your studio furniture.
You can take my word that a quality chair and a nice, adjustable desk can make a huge difference. If you have quality furniture, those extended recording sessions or working with the latest sequence of software will be much less a hassle as compared to doing all that work on some shabby, uncomfortable chairs.
I always tell my buddies in the recording industry to look into good quality ergonomic chairs and desks. In fact, I am also recommending this to anyone in would spend many hours in front of a computer, recording equipment and of course for your workplace.
It is astonishing what a difference a modern ergonomic chair can make. Working will go a lot easier and the likelihood for health problems such as back pains will be pretty much eliminated. You will also have less of a chance to experience common problems such as Carpal Tunnel Syndrome or similar health issues.
If you are thinking about equipping or re-equipping your studio, consider good desk chairs and quality adjustable desks. While it may not always be obvious that those things can make a huge difference just give it a try and see for yourself.