4. San Francisco, CA
Cost vs. Speed: $37.50/mo for 100Mbps downloads and uploads
Other reasons to move here: You won't have to leave the good ole USA for this one, and outdoor activities are available pretty much everywhere. Plus, microclimates.
Why you ultimately shouldn't: San Fran's known as the "homelessness capital of the US", and that's not good for anyone. Unless you're homeless, in which case, why are you worried about the cost of internet access?!