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.
I've tried all the above in different tube systems. These are just my opinion.