I have been thinking on this debate as well. I currently have one viv and am going to be getting another setup viv with some black and blue darts. I am currently misting several times a day by hand with a spray bottle. I have been leaning towards the Monsoon. Someone told me that you can build your own mister setup pretty easily, but I have never looked into it.
I do know that foggers really dont do much and break fairly easy. they tend to lime up pretty quickly and then loose their effectiveness. I haven't heard too much bad about the monsoon though. You do need a false bottom in your viv to allow excess water to drain from the soil though.