Re: Do you regret switching to Time Warner Internet?
I had TWC from January 2004 to August 2006. Though I didn't go from DSL to cable (Mine was from dial up to cable) like you. I didn't regret it for a single moment. I went from 3/384 to 8/512 before Comcast took over my area's TWC.
Like others have said, don't go for a combo unit, get yourself a Motorola SB6141 and a separate router. You'll be much happier with that setup.