Warm copper speaker cables under $500 new

Recent cable experiments have demonstrated two things to me:

1) I like copper better.
2) Unfortunately, while the economy brands are very good, it is possible to do better.

I am now in the market for something that will be warm - not bright in the least - and full, yet detailed. And I do seem to favor solid-core wire (single or more than one, individually wrapped) to stranded.

Any suggestions?