I'm getting some Walnut Cups from 7Keys for the Senn Grado My self.
I'm impressed with how the Black Cherry sounds, and from the impressions I saw for the Walnut I can only assume improvements with the Walnut,
either way :3 I'm gettin excited! I've been in need of another woody and I think the Senn Grado is going to fill that niche very nicely!
I just bought a pair of Khaya from you, through eBay. Looking into building myself some jazz Grados... :D