These are what we use in our office. I can contest to their comfort. Knoll, herman Miller, and steel case make really nice office chairs that aren't over the top flashy. Steel case is the cheaper of the 3 but probably my favorite. I picked up 3 nice ones for $150 ea a few years ago. Once in a while you can find a office closing and selling off their old chairs like this.
then picked up 4 of these old mid century modern steel case rollers for $15 ea.