You can cover the rig with some plexiglass to mitigate the dust, lol, jk. If it were me, I wouldn't that much for board that will only run one card. Have you checked newegg?
He wants to buy only from Tigerdirect, since they take bitcoin..
You want a case with a side fan to keep the GPU's cool. You can run up to two GPU's in a standard case without much issue if you have a side fan and undervolt the GPU's.