Even if you decide to go with thin client devices, the decisions about which thin client device you should use is almost as complex as your server architecture... Throw in the management software choices and you certainly have your work cut out for you!
This white paper, "Choosing the right thin client devices, OS & management software," was written by 2X. I have certified it as part of my "no bull" program. (This is a program where I read vendors' papers and work with them to make sure that they don't contain any marketing hogwash or other standard vendor white paper crap. A paper that is certified, while not written by me, means that you can read it and know you're getting an objective and technically accurate story.)
This high-level white paper briefly discusses the various thin client device options, choices of operating system, and software options for managing them.