silver spades on copper cables?

I'm thinking of reterminating my coincident extreme with nextgen spades. Has anyone mixed copper cables with silver spades or bananas and been happy with the results?
I have and found that there was virtually no difference in sonics.
I prefer silver threads and golden needles.
The Alpha Core MI-2 Vericity I own have solid silver spades. Worked for me.
Consider the quality of the spade also. The better the contact is machined the better the contact. I consider that this is more of a factor than the contact material itself.