My favorites of what I've tried:
1) Hubbell 5362 cryo'd and cooked from Take 5 Audio (ironically the cheapest; also the basis for the Shunyata SR-Z1)
2) Audioquest Edison - silver plated
On the fence about:
3) Furutech GTX-D (G) - (In one system I like them (older stock); in my simpler system I tried them twice (2 different outlets) and couldn't believe how veiled they were; the resolution was terrible for delicate sounds)
Duplexes I didn't like:
4) Audience Hidden Treasure - rhodium plated, made by Cardas (if you like fast and dynamic, I've never heard anything like this duplex; it wowed me but I couldn't get past the midrange which I found too lean
5) Furutech GTX-D (R) - like the Audience, rhodium plated and I had the same perception of sound.
I'd love to try the Shunyata Copperconn, however, they're $300 or more.