I.m OK with viewing PDF's in Finder (Mavericks) but I need to do (2) things and my head is spinning... 1. Combine PDF's into a single, multipage pdf (not easy and it does't always work in Mavericks) 2. Include Stamps & Signatures into a PDF (like I can do on my PC) ie: insert my signature (a png file) on the page insert a "Sign Here" stamp to tell someone where to sign. Any advice is much appreciated. I am willing to purchase the right software!