Our quilt group bought a Go from club funds, and we got the mix and match set to give us lots of versatility. We later added the two arrabesque dies, a flowe die, hearts and teardrops so that we have some applique ones too.
Personally, I have just ordered the double wedding ring set of two dies. I have always wanted to do one of those, and there are a great set of videos on Youtube to help do it.