Just to ask the obvious, stupid question so it's out of the way: You do know that there's a free version, right? It doesn't have all the features, but it is fantastic anyway. You can do an awful lot with it, and it will give you a good feel towards whether you want to pay.
Remember, the ArtRage guys have not said when 3.0 is coming out... only forum-members (who, honestly, have no idea) are saying "soon". It could be months. It could be next year... or the year after.
WARNING: ArtRage can cause serious loss of time, and excessive smiling! Use with care! Frequently!
“All creativity is an extended form of a joke.” – Alan Kay