Probably a stupid question but...

Alright, I currently have Sins of a Solar Empire, but none of the expansions. I'm currently thinking about buying them, but was wondering: Rebellion is stand-alone, does that mean it contains the same material as the previous expansions?

Er, I suppose I mean, would I be getting more content by buying Entrenchment, Diplomacy and Rebellion? Or would buying Rebellion make buying the two micro-expansions unnecessary...?