I'm looking for a PDF app. I have ~20 documents that I'd like to access (for work and pleasure) and I'm looking for a solution. My specific requirements include search, some sort of folder-level organizing, a simple & intuitive navigation system, and reasonable cost. I do not need annotation. I have tried Good Reader and found the interface confusing and the options overwhelming. The Adobe app is speedy and easy to use, but offers no library/organizational features. iBooks and Kindle don't either. I'd be happy to buy an app that offers what I want, but I'd like to hear your opinions first.