I would say that my experience mirrors John's (Jafox). I found both the Dominus cords, Fluid and Ferrox plus the K-S Emotion to be on the warm side of neutral, with the Dominus Fluid version being the warmest of the bunch. The Dominus, both versions, create a lovely 3-D soundstage, but IMHO, the K-S Emotion presented a more natural, extended top end. No, the Emotion was not as extended as the Stealth Dream, Nordost Valhalla or RSAD Poiema!!! Signature, but more so than the Dominus, IMS.
However, because of the OP's price range of under $500, I didn't recommend the Dominus or the K-S Emotion. I suppose one could get very lucky and find one for under $500 used, but it's unlikely. Since Kbuzz did not mention that he was specifically looking for used cords, that's why I recommended the Cardas Golden Reference, which is a good, warm cord which can be had new and/or used for under $500.
Cheers,
John