Sins Trinity, which includes the Original, Entrenchment & Diplomacy versions, is still available for around 16 Euros.
If you want to play any mods, at this point in time, it would be a worthwhile investment.
I've had Trinity for a couple of years now, and consider it one of the best small purchases ever made.
I must admit though, I do look forward to seeing SoGE in Rebellion, even if it's just for the graphic improvements.
Keep up the good work Lavo and the rest of SoGE crew.