I hate comcast, fascist telecom company....If I were a hacker they would be a target of mine. had to deal with them at my old job, and their rates suck. Almost as bad as Time Warner, but TW is surprisingly a bit cheaper.
Now, what you should do is ask for a bandwidth meter, to ensure you are getting the connection speeds you pay for, since that is not regulated at the moment.
TWC actually nets the speeds i pay for, doesnt cap usage, but has by god the worst support i've ever dealt with.