I'm sure you already bought your equipment RedDragon, but this guy explains why you might also need a dehumidifier and goes into pretty good detail about his setup.

http://ifoodblogger.com/how-to/meat-curing-chamber/

I'm setting one up right now and am leaning towards this unit but there are many similar ones: http://www.amazon.com/WILLHI-WH1436H-Digital-Humidity-Controller/dp/B005DK2T2Y