Most good CPUs today, regardless of who makes them, are powered by Pentium processors. Included in your CPU are things like a floppy disc or CD-ROM drive, a modem, and a sound card. Make sure you accurately assess your needs so that you don't end up with an overabundance of components that you do not use. The more RAM you have the more programs you can run at the same time and the more information you can save. Another key element of your computer is the monitor.
All new computers come with an operating system and a variety of programs.
Windows NT might be right for your organization if you want to create a network of computers with a shared memory drive. If you are purchasing more than one computer, make sure the manufacturers and operating systems are compatible. Once you have what you need to get started, check out their Software section to find out how to enhance your capabilities. Included are tech reviews, latest prices, and a list of free downloads. NetAction's On-Line Buyers' Guide offers some good tips for researching products and vendors.