are you looking for cable or DSL? you'll have to choose for now because you can't buy a modem that will do both...
I had a feeling that might be the case, but figured I'd ask anyway.
Essentially this is my situation. I'm currently getting Tv and Cable through Charter which I really have no complaints service wise. My problem really lies in how much it costs me. I'm currently paying 40 for 3mb down 256 up and then another 60 for digital cable. I would love to get rid of my cable service and go with a satellite as it would be cheaper but here lies the problem. Charter is the only broadband that currently reaches my home (Qwest may eventually) so I would end up keeping them as my ISP but since I would no longer have their cable service my internet would increase by another 10 making the satellite move to save money a moot point. I'm also currently renting a modem from Charter for 5 dollars a month. While it may cost me more money in the short term to buy one, in the long run it would save me money.
Essentually I'm stuck in a catch-22. I can't leave Charter and get Dish (or whatever) because it wouldn't save me any money and I can't get Dish because there are no other broadband providers in my area.
As far as speeds. I'm never really hitting my peak speed (I'm hitting 1.5mb right now). Especially with the majority of the bandwidth I consume (Torrents). The only downside to DSLs is that they don't seem to offer anything above a 128kb up.
I would really like to get a lower tier for my digital cable service but they have them manuvered in such a way that I have to stay where I am if I want to keep certain channels.