[if you want to change out dig IC] Digital Cables: Stealth Varidig is very good (It is MY reference), you may want to try also the Empirical Audio's top digital and Magnan's new digital cables. I have heard all three, and all are in the same ballpark. Each does some things very well. It is pretty system dependant which one is best.
ICs: I'm with Tireguy. Jena Labs IC is hard to beat. You can get different... but deffinitively better is tough. These will NOT give you bright highs. I would try to avoid silver ICs. I would not go with Valhalla if you want to curb highs.
Speaker cables: I have heard from friends I trust that Silversmith is quite good (I have not heard it though). I like a few speaker cables expecially for their price. Xindak FS-01 and FS-02 - These cables are great; however, I'd go with the FS-01 if you are worried about the high frequency range. The FS-02 has silver in it, and can impact the highs. (This can be a good thing for some systems). The other speaker cable I would suggest is the Supra Sword. It is the most resolute cable I have had in my system and it has the most amazing mids and highs I have heard in a speaker cable. Speaker cables just do not get much better than the Supra Sword... Period. Several of my friends have sold their Valhalla for Sword.
KF
ICs: I'm with Tireguy. Jena Labs IC is hard to beat. You can get different... but deffinitively better is tough. These will NOT give you bright highs. I would try to avoid silver ICs. I would not go with Valhalla if you want to curb highs.
Speaker cables: I have heard from friends I trust that Silversmith is quite good (I have not heard it though). I like a few speaker cables expecially for their price. Xindak FS-01 and FS-02 - These cables are great; however, I'd go with the FS-01 if you are worried about the high frequency range. The FS-02 has silver in it, and can impact the highs. (This can be a good thing for some systems). The other speaker cable I would suggest is the Supra Sword. It is the most resolute cable I have had in my system and it has the most amazing mids and highs I have heard in a speaker cable. Speaker cables just do not get much better than the Supra Sword... Period. Several of my friends have sold their Valhalla for Sword.
KF