Herman Miller has come out with a few cost effective task chairs, and one recent introduction is Verus. Verus is a family of chairs with a task, stool, and side chair. There is also a bariatric chair if you wished to use the side chairs in a waiting area. They can have a mesh back, triflex back or fully upholstered.
Check out this link to a chair builder and see how you can design your own chair.