Best iPad note taking/notebook app?

What is your favorite iPad note taking app? My favorite for the last year has been Noterize. Unfortunately it got bought and is no longer on the app store and it seems  it will never get another update.  Noterize is really good now, but I feel more comfortable with an app that will still get attention from the developers.

So I am looking for a replacement but I need an app that allows import of PDFs with the option of adding the import to a document I have already been working on. Most of the other note taking apps I have tried do not have this function and its expensive to try all of them so I need your help!

 Any suggestions?...