Texas and Georgia already are heavily gerrymandered for Republicans. So is South Carolina.
Texas is a court map IIRC, since Democrats controlled the State house in 2001 and couldn't agree with Perry on a map so it went to the courts. Remember they dropped to 76 seats in 2008--not something that could realistically happen in a Republican-Gerrymandered map. They'll also probably pick up a seat or two in South Texas since they can uncrack the Republican votes there.
Same with Georgia I think, though I'm pretty sure it was a Dem Gerrymander turned Dummymander, so I don't know. Republicans tried to redraw the map in 2005 but got struck down, which is why the current congressional map looks kind of reasonable.
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