Reasonable (big) default font sizes

In our app (a CAD type app for the casual computer user) we allow users to choose from a number of preset font sizes. These defaults are picked pretty arbitrarily from what OS X offers in their default Font Picker dialog, e.g.

  • 12
  • 14
  • 18
  • 24
  • ..

all the way up to 144. Now we'd like to add more default sizes for bigger fonts and wonder what reasonable defaults could be.

I guess in the first place we'd like to understand if there's any reasoning behind the existing defaults in OS X, e.g. why 24/26/../144?

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