Update time.  After burning in the silver Duelund bypass caps for 2 weeks straight, I have a pretty good idea of the sound of this bypass cap.  Also, remember that I swapped over to the Duelund silver from a Duelund copper bypass cap.  
Things I liked about the silver - far more resolution and better transparency and soundstage layering
Things I didn't like about the silver - loss of tonal beauty vs. the Duelund copper cap
So, what to do?  Quite the dilemma.  I love the extra resolution of silver but I cannot live without the tonal accuracy that copper brings.   Well, here's a pic of what I decided to do: 

Yes, I decided to use BOTH.  So far the sound is VERY good.  All of the copper tone plus most of the silver resolution.  Me happy.