Hey I'm from Montreal too, Shakes and I are both using Videotron Extreme Cable service, and it costs 59$/month (Canadian dollars....), it's very stable, hardly ever goes down and I've yet to see any kind of variation in my bandwidth. They have such a huge capacity that their users never maxed out the potential, so each user has as much speed as they are paying for even at peak hours.
On a very fast site like Microsoft's Download Center, I can almost top my 700kb/sec cap. On every other site, I cap at the speed THEY are going (which varies from 200 to 450Kb/sec depending on the sites...).