I'm actually contemplating the same thing right now... I've been trying different clubs with the TT DG S300 (130g) in them and love the heavier weight. I'd go with the KBS but I can get the s300 for a song and would rather save some money going into 2014.
The Nippons and the DG's both weighed 130g, but the Nippons felt so much better. The S300s felt extremely boardy compared to the Modus Tour 130s.