Keep cable. DSL may be too slow. read their fine print on what the actual speed will be.
Usually the fine print says speed not guaranteed, may vary.
I was paying for DSL 3.0 download and never went above 1.3. They route the longest way around from the central office and my incoming phone line (underground) must be in terrible condition (couldn't hear most of the time on the telephone.)
After I changed to cable, phone volume is normal and my speed is 30.0 down, either wired or wireless. Consistently good.
I live 50 miles in each direction from a major city in a hilly terrain so no antenna worked for local tv after they went digital.
I bought the ROKU 3 box this Tuesday. Easy to setup. I am using the wired network cable connection (wifi is avalable). You need to buy a DVI cable to connect the ROKU to the tv and a network cable to your router. Just add the code they give you at Roku.com/link then they download updates. It connects automatically.
You are given a long list of free channels to watch like the History channel, A&E, NATGeo, Lifetime, FOX News & Business, Disney, Disney Junior, PBS, WeatherNation, Tastemade -food & travel, sports channels and more plus music like Pandora. Cnet for tech news. TubiTV for movies (most from bargain bin but some well known good movies and tv shows). Some commercials.
I have Amazon prime and the setup was to go to amazon and type in a pin you create and it somehow talks to the Roku device and you now can view your list of shows you setup on the Watchlist at Amazon under your account.
Many many more to choose from if you want to pay a monthly subscription though I do not see that happening other then Netflix. The remote makes it easy to get around and pause the broadcast or FF or RW. TIP: unplug the earphones as it runs down the batteries in the remote in a few days.
I can with my Mohu Leaf square antenna for over the air tv I can watch all kinds of shows for FREE! More of a selection then what I have on cable. It looks like I will cut the cord and just have internet service. Add ROKU and the tv antenna and my bill should be about $45 a month vs $137