Parkinson's Foundation, Inc.
The Parkinson's Foundation makes life better for people with Parkinson's disease by improving care and advancing research toward a cure. In everything we do, we build on the energy, experience, and passion of our global Parkinson's community.
Michael J Fox Foundation for Parkinsons Research
They are focused on research and are rated highly on charity navigator (http://www.charitynavigator.org/index.cfm?bay=search.summary&orgid=7597#.VYRR2RNViko).