One alternative that I've used up here in Toronto is to use rigid styrofoam insulation. I believe that anything over an inch will act as its own vapour barrier, so you won't need the plastic. The rigid panels can be attached directly to the basement walls.
If you use fiberglass insulation, the vapor barrier goes on the warm side of the house.
Also, an alternative to dehumidifiers is to have a fan running at one end of the basement and a window open about an inch at the other end of your basement. This method uses much less energy than a dehumidifier.