I am looking for suggestions for National ISPs that would work best in our situation. Sorry if its long winded but I tried to answer possible questions up front.
There is a strong possibility that we will be doing VOIP between our OKC (Home Office) and a new branch office in Denver (as well as possible expansion in Charleston, Nashville, Pittsburgh, Atlanta, San Francisco, LA, and Seattle further down the road).
We have done VOIP between sites before and have dealt with the random QoS problems associated with not sharing the same ISP (SBC/ATT and Nuvox). This is the situation we would like to avoid making twice. I am looking for suggestions for ISPs that have a national backbone that would allow our traffic to stay within their local network (w/ SLA preferred) and not traverse the public internet (no QoS). Due to what I understand about the cost of Point-to-Point T1's I don't believe that is an option.
Also it would be best if the ISP could provide both T1 and xDSL options. We are looking at integrated T1 access (we currently have a PRI for this) for our Home location and possibly for the Denver office as well (depending on its size maybe just DSL and separate phone lines). I assume that a majority of these possible branch locations will be small offices with only 5 to 10 workstations so DSL would be the more reasonable option. Also due to the contract nature of these branch offices, one year contracts would be preferred and three year would be out of the question.
I have briefly searched broadbandreports.com, but most of their info deals mostly with just xDSL providers, but doesn't answer the question about the provider's backbone. Also, before I start asking around for T1 quotes, I thought it would be best to get some expert suggestions.