dstarr3 :
Holy cow, I am NOT going to spend $300 on anything with the Biostar name on it. Unless it's a factory.
I would consider it. I would then either (half joking):
A) Replace all the caps on the board with decent models (and add the caps that they left out),
B) Pull the X550AT off this board, and pray that it's pin-compatible with one of the other Intel ethernet controllers, or
C) Pull the X550AT off this board, and print a custom PCIe card for it.
In all seriousness, I honestly can't picture a build that would both need a 10 Gbe controller, but could make do with Biostar quality as it has been in the past. The closest I can think of is as a tinkering build for an IT company, or possibly as a benchmarking build for a review site.
This board could be better quality than Biostar has had with previous products, though.