Global Knowledge posted an article noting the top 18 certifications worth having. Global Knowledge is a business providing learning services and professional development solutions, so they are not really driven to pick one certification over the other, but are vested in knowing certifications and their value. I would think the only motivating factor to do anything that may not be true is to have only certifications that they perform training for.
In my opinion this list is pretty legit list by GK. Disclaimer, this article is my personal opinion and not the PMI Madison chapters opinion. Anyways, go check it out. One of the things you will see is the PMP® certification is on top. Whats third? CAPM® another PMI certification.