Mod Bod,
I would look carefully at the comparison chart between the new versions. Alot of the instruments and suites have not really been upgraded for ages? Alot of them have been around since X1 / X2 days. Im sure many here have numerous copies at this stage.
Just something to consider. Rapture, Dimension Pro are old now .. I think. But maybe some Cakewalk peeps will disagree with me and/or tell us these will be updated OR new ones are on the way.
I have X3 producer and by default most of the extras with the new version already. Alot I dont use as - is the case with yourself I have alot of 3rd party MORE UP TO DATE Plugins. So I am considering going with Pro this time.