Hi,
As someone who has worked on a product that provides InfoPath to PDF Conversion I have to warn you that it literally takes years of fine tuning to get this to work properly and reliably without making your environment unstable.
Although I have worked on this product, and therefore am clearly biased, you should seriously consider evaluating the
PDF Converter for SharePoint. It is used by many, well-known, organisations and does everything you need....and more.