Cablecom is definitely cheaper than the ADSL providers. Also they tend to be proactive with increasing the speed forcing the others to do it as well.
On the other hand side their support really s**ks, but hey that's only if you ever have a problem, right?
I didn't have the choice because we live in an older house with the really old school phone sockets...no adsl signal here so we had to go with cablecom.