Assuming that it was feasable and you have a site license for Poser for mutliple installations, I would go for the fastest cpu, 2 gig Ram, fast HD, cheap video card and a cheap monitor. A switch box and a couple of cables and you can share the monitors. Don't really need them while rendering. Same thing for the video card, don't need it while rendering. This concept is just for rendering, nothing else.

I must remember to remember what it was I had to remember.