Good thinking!
Except USB 3.0 ethernet adapters don't seem to exist yet.
But I expect they will show up at DX within a month or two.

And there's no super need for SATA, since USB 3.0 provides similar speeds (and DX has the SATA-->USB3 adapters).

Which means that perhaps a combo USB3 + ethernet PCIe card would do too, if they exist.