i know of:
tranxactglobal
nocster
aplus
skynetweb
servermatrix / the planet

anymore?

Rackspace
Servint

Verio as well.

AngelNetworkz. Ask for their Dallas servers.

Via Networks in Atlanta

Are you looking for Fully Managed?

Dinix, if you don't care about the price

i think unitedhosting.co.uk and hostnexus.com also do fully managed servers both have good reputations on here.