There's some nice colo places in Texas, though, most are in Dallas.
http://cologuys.com is in Dallas, and has reasonable prices. They host some of the larger webcomics out there.
http://colo4dallas.com/ is very good, but expensive.
http://www.layeredtech.com/ can get you colo at the Savvis datacenter, however, you have to contact them to get a price quote.
http://www.theplanet.com/ also has colo, but same story as LT on pricing.
There's also a lot of companies in the Infomart who offer colo, more than I can list here.