I totally agree with grasshopper. There is no perfect way to rig perimeter stud walls with vapor barriers and fiberglass insulation, etc. Much debate about this issue and many different conditions exist in any given house. The way to be foolproof about it is to cover the concrete inside the house with rigid foam sheets - 2" glued is perfect. This way there is no separate vapor barrier, etc. None is needed since there is no air interface with the concrete. Then you can put your partitions wherever you want and no need for plastic sheeting or fiberglass. As long as the exterior of your foundation is sealed and you don't have leaks then you will be fine. This holds true for whatever kind of improvements you make to your basement. Dehumidifier is important. Best to not have to empty a pan out but to have it drain outside, or into a drain, or into a sump like you might have for your AC condensate.