Spk cable with deep,lush,spacious sound....

I'll put in a third on the Acoustic Zen Satori's. I use the Satori's in my wife's HT set-up, that sometimes is used for 2 channel music. In my rig, I use Kimber Select 3035's, which may be a little pricier than what you want.

I agree with Jkaway(John) that if you try the Alpha Core Goertz MI-2 copper ribbon there is excellent chance you will get exactly what you are looking for. I formerly used MI-3 which is same sound as MI-2, for its power amp rating, according to the factory rep I spoke with. Although not the "best" cable at its price for detail or three-dimensionality, it is close, being excellent overall, musical, and a bargain when bought used on Audiogon.

Stealth Ultimate Ribbon should work good for your requirement. Nice warm top, full mids with good chewy bottom. The AZs are punchy but less musical than the stealth. Cardas seems to sag. XLO is a bit on the grainy side. Overall, NBS Master probably the best. Punchy, musical, but not as warm as Stealth.
I've tried all the above in different tube systems. These are just my opinion.

In the past, I felt Analysis Plus Oval 9 accomplished most of these things for me, and more recently the Acoustic Zen biwired Hologram II, and Audience AU 24 were standouts.

I agree with S23chang on the Stealth UR. Very smooth cables with a good bottom end. I had them for about a year and only sold them because I bought new speakers.
They work very well with "leaner" systems.