You might wish to consider the Alpha Core Goertz cables. While the Valhalla is slightly lighweight in the midbass (both interconnect and speaker cable), the Alpha Core, which sounds extreeeeeemely close to it sonically, has a more powerful midbass, making images more solid. I think these two make a great match, one that I am using. Just be sure that your front end has very good midbass, because the Valhalla will most definitely "lighten" the weightiness of the sound.
Also, you could consider having the Valhallas retipped with the NextGen connectors, which Nordost will do --- for $500.00!! It does add more weight to the bass frequencies and gives the presentation more "gravitas."