For now the Mini is running, primarily, as a media server that is also hooked up to a TV on the opposite side of the room. Now that there is a new SSD in there, I will prob end up using it more for primary computing while the Windows PC is just as a gaming and Linux box.
I initially also was thinking about a NAS for a rackmount I have, but the Mini wasn't much more, cost-wise, and could do much more.