Unless you've just gotta have it now, I'd wait. If I recall correctly, they usually offer a special sale period at least twice a year, and offer discount upgrade deals to existing customers for the new product line. But, the new version doesn't cost more than the old version, so it comes down to the cost of the time you have to wait vs. the upgrade fee ~$50.

Usually the Mac update is only a few months (if that) behind the Windows update.