Well, no, it's not really news that when you tell TWC or Comcast you're bailing, they will dig out "promotions" to keep you.
I would be very suspect of the claim from the Customer Service rep that the bill will only go up 5 or 10$ per year, though, that's not my experience.
I do think that the $70 or so the OP is paying for Internet and phone is still too high, unless the Internet is wickedly quick. And seriously, the IP based phone that he is still paying $30 or so for is WAY too much.
Power goes out, Internet goes out, phone goes out. Spend that $30 on a treditional copper-wire line for 911 and such. Otherwise, why would you need more than your cell phone? IP phone service is WAY overpriced.
Yes, I know, after the copper wire hits a switch of some kind, it probably gets routed over IP anyway, but at least with copper wire to your house, you almost always have a dial tone, hence 911.