Before you start investing, here is one that already works with VFP:

http://www.mindseyeinc.com/ReportEngine/index.htm

It sucks in the FRX report into a non-modal, user-definable window size and location and save natively to PDF without the need for any Acrobat product installed on the PC. It actually saves to PDF faster than the Acrobat's PDF Writer does. It also does water marks.