I don't have a specific card in mind. But, any modern card should work. I forget the absolute minimum requirement for HLSL, but I'm pretty sure an old NVidia 8800 series would work just fine. However, I'm not sure what you mean by dedicated power station? Are you fine with a power connector to the power supply? I picked up a lower end nvida 700 Series card (750 ti?) for my workstation and it doesn't require any external power as it runs off the PCI bus power. I'm pretty sure all the older cards were just inefficient enough to need a power connection from the PSU, though.