I have a DT Systems 2020 collar that I use for training my Lab. It seems to be a good collar. It has been waterresistent for the past 8 months. After reading many books and viewing many videos on electronic collars, I have found the use to be more important than the collar. If you want to put your dogs on their asses, use the most powerful one you can find. I do not recommend nor condone this type of " training" . Stimulation should only be enough to bring the dog aware of the fact that " something is going on" . This is only my opinion. I recommend a training video for recommendations on how to use a collar, then research the brands to find out what will work for you.

Good Luck!