I personally like the mesh chairs. Ones that have mesh seats and mesh back. I wanted to get one like what I have at work only down side is they where like $250+. I settled with a mesh back chair adjustable arm reasts, and a normal seat. I got mine from Office Depot for like $70 if not mistaken.
I uses to have a tall back chair, loved it for a bit but it wore really funny and felt like if I was leaning back my heat was being pushed way to far forward.