If you could order a perfect computer for Poser 10 and future versions of poser what would make up the guts of the computer?  

Honestly, if I was building the "perfect computer", it wouldn't be a standard PC. I'd build a home render farm. I'd run Poser on a decent computer and then use the render que to ship the scenes off for network rendering to the render farm boxes. Ideally, those would be using multiple CPUs and GPUs, switchable, depending on the rendering app. I'd also attach some expandable network storage capability, as well. There are plenty of guides on how to build your own home render farm. It's going to have to be custom-tailored to your applications, though always deciding in favor of more processing power and memory is never a mistake. (As long as the components are compatible with what you're running.)