I only have personal experience regarding the Eclipse and the Coincident, but based on that experience plus the prevailing scuttlebut on the Valhalla, all the cables you mention are good choices at their price points. However, the prices of these cables are extremely disparate ($300 for the Coincident, $600 for the Eclipse, and $3300 for the Valhalla). Do you have a particular budget in mind? If cost is not an issue, I'd certainly recommennd demoing the Valhalla in your system. Another cable you might want to consider is the Silversmith Audio IC.
