How long are the trips you're planning? Like Reefhound said, Vortex isn't really worth a trip in itself. You can see the entire basin in 1/2 a dive. And on weekends, you'll need it because all the classes that happen there will cause the visibility to diminish quite fast.
If you're coming over for a few days, I'm sure a few of us could offer several recommendations that would keep you busy. The panhandle has a lot to offer. You might also want to consider doing a cavern course while you're out here. It would open up even more sites and diving for you.
