Covert,
I read that the Supersonic works on EVDO/EVDO Rev A, so my guess is, wherever your Instinct works, the Supersonic should also work. I'd say you would have the best of both worlds. When in Dallas, you'd would have 4G broadband type speed like you get on your desktop.
It would be great if the rumor about Wal-Mart putting WiMAX on all their buildings comes true. The following map shows where all their stores are located.
It looks like this would give you coverage at the university as well.