What's surprising to me is that, at least with Comcast, there's simply no way to get the cap-free service I had before. I don't have the option to pay more to remove the cap (other than paying per gigabyte over the cap, which is silly).
EDIT: I don't know what the advertised rates were, but they were less (20/5?).
I don't remember there being a specific name for it.
I would not be surprised if they don't offer the exact thing anymore.
My advice, get some relatively low speed (16Mbps) and hope it's much higher, like I got.