I have upgraded to v4 Pro for around $70. Apparently, since v5 release, 30% is the maximum discount.
Currently, I have v6.5 Artist with lots of goodies from previous Pro. And the only difference, besides Atmos and Project Page, is the lack of Chords Track and Score Editor, which is not something I can get easily my hands on anyway while in exile.
For those who don't need aforementioned Pro features, Artist version should be sufficient.