Need advice on rich sounding cables

If you are going to demo cables, I would add Fusion Audio cables to your list, which are known for their midrange "liquidity". I found their Enchanter power cord to add some warmth to my Pass Labs amp, while preserving frequency extension. Cheaper SC options that play above their price point by a good margin are Clear Day Double Shotguns ($500), which I use, and Triode Wire Labs ($700). All offer generous, no hassle return privileges. The Cable Co is great, but their 5% charge per cable is money down the drain if you don't end up buying from them.

stealth is nice but wrong price for performance try calling Robert Lee at Acoustic Zen he is a great guy with a great balanced product that you can get what you need with your budget intact .
The kubala I heard seemed little tubby and closed down to me,tara was thinner causing wrong timbre but great product.
just my 2 cents

Looking for "rich sounding cables" is the wrong approach. If your system needs richness, look at your components, particularly your source. $4,000 can be better spent elsewhere, rahther than on cables! And, I have experienced wonderful 'rich sounding' speaker cables, Teo liquid cables. Unfortunately, they are more than $4,000.

Within your budget you might want to give High Fidelity CT-1 a try. Most reviews claim they have in spades the very qualities you're after.

The more I think about your quest, the more I think you should listen to some cables with gold in them, at least before making a final decision. "Rich sounding" is gold's trademark. The list of cables with gold is getting longer, but a couple of well-respected brands include Jade and Gabriel Gold. If you want to try gold on the cheap you might look for a used pair of Stealth PGS, often available for $400-$500/pr here on the 'Gon.