Mark, I've decided not to go with the Obbligatos, likely not enough warmth for this application. If the Mundorfs don't work out I'll try the Auricaps, perhaps Cardas Golden Ratio, or Jupiter Beeswax.
The Mundorfs really aren't that far off, just need a bit more warmth, I'm trying different isolation techniques, this weekend should tell more. I really want the Mundorfs to work as the increased resolution is really nice. I also suspect the Mundorfs would be perfect in a tube DAC, wish I still had my Audio Aero Prima DAC (same as in Capitole) or Audio Logic 24mxl to try them in.
Let us know how the Russian caps work out.