Need a PDF Annotator Which Can "Save As."

I want to import a PDF into my iPad2. It will be a map which I can draw over and annotate. I want to be able to save it, without destroying the original, so I can draw over the same map/template repeatedly. I'll then mail or transfer the annotated PDF to my computer.

I have Goodreader, but I haven't found any instructions on saving versions.I know there are dozens of APPS out there which will very ably allow you to annotate over a PDF. I haven't been able to determine if any of them will allow me to save versions of the PDF and keep the original.

Can anyone suggest an APP which will meet my needs?

 

Not quite. I'm really looking for the original PDF to act as if it were a template. In my copy of Goodreader there is an option to keep the original and only save the changes as a new file. That is good. However, I'm finding Goodreader to be very dense and difficult to navigate. I want something very simple. I open up a PDF, start writing over it with a stylus in quick order with no more than one or two gestures/strokes before I can mark it up, saving it quickly as a different file and then doing it again almost immediately.

Simplicity is the key. I'm surprised that such a full featured APP as Goodreader is so unintuitive.