I haven't seen the bundle deal from AT&T that includes a cell phone, but their DSL is usually pretty good, particularly if you're moving into a heavily urbanized area or if you plan on having to use your internet at peak hours.

Cox is going to use Cable internet, which is one big line run for an entire neighborhood or area, and if a bunch of people are using cox, and particularly if they're all using it at the same time, your speed can vary wildly. Although they do have some deals for cable tv and cable internet that are pretty good.

I think you're going to save the real money by buying one of the bundles from either provider, just find which bundle actually saves you more for what you need. The actual internet speeds depend on what kind of area you're moving into. Cable is generally faster, but if you're moving into an area with a lot of teenage gamers, or just heavy internet use in general, DSL can win out pretty easily.