godzookie2k, I used to convert from Quark to PDF that way until I found the Quark PDF XTension. It basically does the same/similar thing, but when you use it it goes straight to a PDF file, so there's no manually dragging the Postscript file onto your Distiller window.
For you Quark enthusiasts, I suggest a visit to the Quark user to user forums. There's tons of useful info there and info on XTensions like the one I just mentionned. Great place to ask (so-called) "stupid" questions and so forth. Great place to get info on anything relating to Quark in general from people who have used the application for ages.
As for the most cost effective method, I'm not 100% sure if you can convert to PDF without the full-blown version of Acrobat. There is a print to PDF printer for the chooser, but I'm also uncertain if this doesn't require distiller to function correctly.
If you just can't afford Acrobat (and I don't mean the reader, that's a freebie) then making postscript files and sending them off to someone who does have the full version of Acrobat to convert for you is the only other option I can think of.
Mike