Take a look at our Getting Started wiki. You'll find links to a lot of the info that you're interested in, such as buying a PC with Intel vPro technology. You will need a software solution to go with it (management console) - there's a list of some of the major vendors on that wiki as well. Take a look at those resources and let me know what you think - I am not sure about demos, but I can find out for you. If you work for a major corporation, you may have an Intel sales rep who can help you with that.
Thanks for the info! It has been very helpful!