Do those cable companies have packages where you don't have to buy cable TV, too? I'm using Verizon, and I don't really see a reason to change, since I have my landline through them.
You can get it without cable, but I think it's more expensive.
I'd prefer DSL, personally, but we decided not to get a land line (Belle and I both just use cell phones), and most DSL providers require the phone line to be activated. And we do need cable, for Battlestar Galactica and Project Runway.