Is there an significant audible difference in the WAV-files in the audiophile pak opposed to the WMA-files in the other paks. Provided the fact that I use BiaB to create (some) Realtracks, export them to either PTPA or Cubase (mix and fiddle with them) and then create MP3-files. Would one (average person who doesn't own a stereo that costs the price of a house) hear the difference?

If the answer is yes, is it possible to upgrade from 2009 everythingpak to the 2009 audiophile everythingpak? Not that I would want to do that right away, but I may have a good use for it in the near future.