Chris, Ken is right, for your conditions (hot in summer, etc.) there are probably better types. You can look for bargain orchids after Mother's Day at more than just Wal-Mart. Lowe's and grocery stores both stock up in years past. They have some other interesting varieties besides Phals, too. Just look for healthy-looking firm foliage on the orchids that are on the "death racks". Lowe's is especially good for marking down any orchids that they can't sell before the blooms are finished.
I've also had good luck with orchids from Trader Joe's. They are usually around $12. (don't know if you have a TJ's in your area) As far as types, I'd imagine anything with large pseudobulbs (fat stems underneath the leaves) might be better suited to hot and dry conditions. Hey, Daisy will probably have some suggestions, her conditions might be close to yours in summer.
