[64GTOBOY]

Huge subject so I am just going to point out that Pro Tools works best with 2 hard drives and processor speed, ram and bus architecture are all going to be critical as well as you have to consider what interface you will be using as it seems the fastest these days often have thunderbolt and the newest upgrades will probably be headed that direction also. Your personal workflow will also come into play: heavy or light VI use, number of track at once "real world" instrument recording capability needed, average session size, audio for video editing usage requirements, plug ins usage, outboard/hardware insert needs, etc etc etc. I would recommend hitting the forum links for builders of PT specific PC's and applying those concepts