I really can't comment on other countries as I am only aware of the realestate issue in Qatar. You need to reserve a MINIMUM of 6500QAR just for rent so anything above that would be for cost of living such as telephone, food, water/electricity, transportation AND then money for savings. I would assume the bare minimum someone can work for and live independently (ie not sharing a home with several other men) would be 13 000QAR and once again this a minimum. Please remember that things are much more expensive here than in Pakistan the extra costs do add up and quickly.
go www.gulf-times.com look at their classifieds and see rental prices...they change daily. this can give you an idea of the rental rates out there