Install Windows onto Networked Machines

We have about 100+ new machines that we purchased for use in our organization. Normally, we configure each machine separately, but I've been assigned the task of finding a suitable solution to possibly image one configured machine and then deploy it via the server over the network to install on all the machines. So far, the only feasible one I've seen is Remote Installation Service (RIS) a configurable feature found in Server 2003. It looks really drawn out and I'm a bit hard headed, so could someone break it down for me, or provide an easier solution?? Thanks!!