At the moment, we have a PIII 700, a K6 ?350?, a couple of PentiumI's in the range of 60-200 MHz, and a couple of other bits and pieces.
A projector for outside views is way outside of our resources, and all of our monitors are 14 inch.
For the CDUs we'll probably use small portable black/white TV sets.
Here's a concept of our setup (click to enlarge):
Made with dia
For the sound system our current idea is to use a 4+1 or 5+1 soundcard for most airplane sounds and another simple sound card (onboard the sim machine) for ATC(mono) and Ground Prox Warnings (mono)