I'd second the Gabriels. The Gabriel Gold Revelation MKI (biwire) have bested many more expensive cables in my system, and likely will meet your stated criteria. That said, I don't see a way around experimenting and seeing how a particular cable sounds with your speakers/ setup. Component matching and individual tastes/ hearing can vary greatly. Since you're looking to buy used, try a few cables out and resell if they're not your cup of tea. For a little less, I also liked the Supra Sword.
What next after Audience AU24 and Siltech G3?
I'm fairly satisfied with my current cables but was looking to change/upgrade. I'm looking for a little more detail and wider soudstage without brightness/harshness. Budget is around $400 (used) pair RCA and $800-900 (used) speaker cables.
System consists of:
Sonus Faber Cremona - Audience AU24 (non E) speaker cables 2M.
Pass Labs 250.5 - Siltech SQ28 G3 RCA
Thor Audio TA-1000
Lector CDP-7t - Audience AU24 (non E) RCA
Trigon Vanguard II - Siltech SQ28 G3 RCA
Nottingham Ace Space - stock RCA
Also have Crystal Cable Piccolo RCA. Nice cable but lacks the bass weight of the Audience.
Thanks
TG
System consists of:
Sonus Faber Cremona - Audience AU24 (non E) speaker cables 2M.
Pass Labs 250.5 - Siltech SQ28 G3 RCA
Thor Audio TA-1000
Lector CDP-7t - Audience AU24 (non E) RCA
Trigon Vanguard II - Siltech SQ28 G3 RCA
Nottingham Ace Space - stock RCA
Also have Crystal Cable Piccolo RCA. Nice cable but lacks the bass weight of the Audience.
Thanks
TG