This is nowhere near a comprehensive list of quality office furniture manufacturers. I would like to note that in mentioning these companies, I am not suggesting that you buy from them. I use these name brands because my experience in the industry shows them to be highly respected.
All of these manufacturers offer a wide selection of high quality office furnishings, so when you buy it may just come down to a single review or small bit of information gleaned from these articles that helps you make a final decision. Therefore, when shopping for your office furniture and accessories, take your time and read and review about manufacturers and their respective furnishings before buying.
You may always shop brick and mortar or online discount furniture stores, but because it is most desirable to have durable office furniture you should always consider brand name manufacturers also. Absolutely there can be major price differences, but typically the quality from brand names pays off in the end. Saving a few dollars now can cost you more later. If you buy cheap now, you will probably be spending more of your valuable time sooner than normal trying to replace the cheaper furnishings because they just do not hold up as long as the brand name items.
Of course, if you are buying for your own company or office you may be able to take certain liberties as pertains to cost when deciding on the final purchase. If that is the case, your personal pleasure and satisfaction when sitting in your office enjoying the new surroundings will make a difference (rather than just price). The reputation and standards by which each piece of furniture is built may become a priority, but often there is so little difference between the quality of the products it comes down to the most eye appealing concept and/or comfortability of the office furniture for you and your work space.