Well, since I can't help with the desk, maybe I can help with the seating. If you're interested in a new chair, I HIGHLY recommend this one. Affordable, comfortable and adjustable, it rivals chairs that cost twice as much. It has done wonders for my lower back pain. My only gripe is, at least on my particular chair, sometimes the back loses its angled setting, resulting in you falling back with a sudden jolt and a necessary readjustment. Other than that, it has been perfection, and it really only happens when I lean back too quickly/with too much force.
http://www.officedepot.com/a/product...Mesh-Mid-Back/