I'm a medical student with an iPad Mini Retina on the way. I have about 30 hefty medical E-Books that I want to be able to read and do some simple annotation with. Here are the features I'm most interested in. 1. Functional reader that is able to switch quickly between these large files with minimal lag and load time. 2. Once I'm in the PDF the ability to quickly and efficiently zoom (similar to in iBooks perhaps since i'm on a mini), scroll and search for text along with some basic annotation tools (highlighting). All with minimal lag or stutter would be GREAT. 3. Easy and simple organization of files with folders. 4. DropBox support would be awesome. 5. As a bonus maybe even support CHM files if such an App exists. I haven't tried any PDF apps yet, since my iPad isn't here, but these are the basic things I'd like to be able to do. Other features would b great, though i'm not sure what more I could ask for. So if anyone has any suggestions that would be awesome. Also for those that have tried apps like GoodReader or PDF expert would those suffice? I want a reader and organizer first and an annotater second.