Depends on the installation really.I would guess the FirePro or Quadro are bad choices for gaming unless they are hardware identical to a consumer card and can be installed as such by the guest VM. AMD Radeon cards can be passed-through a VM without issue, Nvidia Geforce cards have restrictions for this.
For a multihead setup, where monitors are hooked directly to the card, the gaming GPU might have been better (don't really know), but the server/workstation cards tend to be better optimized for virtualization and remote rendering over a network, but getting the same performance out of any card running a virtual machine is still tricky.
You're not also testing you cooling solution?temporary housing with high level of mess
Speaking of which, how loud do you expect it to be. Server fans aren't known for their acoustics, but you also mentioned you were taking that fan and putting it on a larger heatsink (meaning you can run it more slowly)