You will definitely need a booster. The manual system in your car now won't exert enough force.
From my research, it probably not worth switching the rear brakes. The fronts do most of the work and changing the rears creates a lot of work and expense to make the parking brake work properly.
I bought my kit from Stainless Steel Brakes. They say I should have them in a couple more weeks (built to order - 4 or 5 weeks lead time)