Sumatra PDF is hands-down the fastest and best PDF reader that is only used for reading, and nothing else. I use it in the PortableApps suite. For creating and editing PDF files, especially the quick and easy way by "printing to PDF", Nitro PDF is a good replacement for PDF Creator, which used to be popular, but has had a lot of controversy due to unethical malware bundled with it. For everything Sumatra PDF can't do, Nitro PDF has worked well for me. I also use PDFescape.com for adding signatures and other little edits.