Web Testing Environment

Does anyone have any usefull information or good websites I can access with information on webtesting environments? We have to set up a web test environment with as many combinations of operating system, modem, ISP's, browsers, PC Specifications as possible. I need to get a matrix drawn up with info on various compatable combinations which would typically be in use at home or in a small office environment. This will be used to test web based solutions aimed at the home user or small business. E.G. A home user with Windows 2000, 56K modem, PC with 128MB RAM using Netscape Navigator.