1) Time-Warner - very fast, decent customer service, not AT&T

2) Grande Communications - often very fast, offer supercool FiOS in some places, good pricing, sometimes excellent (but sometimes bozo) customer service, and at least they're not AT&T

a distant last) AT&T ... 

... Let me tell you, these jokers are probably the worst company we have to deal with. If they have even the smallest opportunity to screw something up, they will. I'm serious: Call to change your billing address, they cancel your internet service. We ask them to install internet, and they put it dangling smack dab in the middle of the office and charge our client a mysterious $300 for moronic work, and then we have to come back and arrange things logically and have to charge for another couple of hours. We ask AT&T to troubleshoot a modem, and they log onto my client's #$^%@! server, and change the IP address -- a huge no-no -- which shuts down file access, and forces me to make a bloody emergency call to set right. 

Plus their internet is like 1/3 the speed of everybody else's. At one of my clients' office, it feels like a dial-up connection, and they say they can't make it faster.

For the love of all that's good and right in the world, please don't make us have to work on an AT&T connection.