A voyager is never a poor idea, but at the same time- you're not going to get one with the money you get from selling the SH-101 obviously. I'd say that for the most part you're fine. Perhaps depending on the type of music you do, an analogue (or machinedrum) drum machine might help you out a bit? Even an M-base01 just for kick? I think you're already covering some nice sounds there.