[racket-dev] Downloading DrRacket for Mac is hard?

I received a plea for help from a person who is attempting to learn
how to program for the first time. They found the DrRacket download
page and were presented 5 different options for downloading DrRacket
for Mac:

   Macintosh OS X (Intel i386)
   Macintosh OS X (PPC)
   Macintosh OS X (Intel x86_64)
   Macintosh Darwin (PPC)
   Macintosh source

This particular novice had no way to choose, aside from a vague
impression that they probably wanted one of  'Intel' ones, and so they
abandoned their attempt to download DrRacket.
Can we make this better? Does the combo box auto detect the
downloader's platform for the User-Agent header. If so, then the next
step is to change the layout to:

      Download:  __Macintosh OS X (Intel i386)__
      (this is the version of DrRacket for your system. In rare cases,
you might need a version for a __different system__)

where the link "different system" leads to the whole combo box.