I started out with a Whisper Lite. Glad it was never too dry as I could easily start a forest fire getting it primed. It puked on me after about 3 seasons and then I picked up an MRS WindPro. I really like this set up and used it religiously for a couple years. Last year I had a few discounts and decided to throw a Micro Rocket with some of the other purchases just to check it out. I was impressed and since picked up two more just to have something in the work truck, personal pickup and my back pack. Nice and light and heats water just fine for me. I have had critters down in up to a foot of snow and it has worked well to get a fire rolling. Turn one upside down and you can torch anything. It is not great in wind unless I can block it, but it was my vote in the list above. If I could only have one, from the ones I have experience with, it would be the WindPro, but I am a big fan of the Micro Rocket as well.
I have friends that really tout the JetBoils, but I don't have any experience with them. If my others go to hell, I would give it a shot.