I went from a Go to a Studio. I use mine for cutting out pieces for large projects ( I tend to make large quilts) and I also cut binding and pieces for QOVs. I can use almost any die in it with an adapter (when necessary). As others have said, it depends on how much you will use it, how much space you have (though the Studio 2 [new version] folds up into a smaller footprint for easier storage.
You can find a lot of useful information from Ebony Love's website (
http://lovebugstudios.com/). She is the main die cutting expert. She has written books about the various dies.