Duelund capacitors are highly regarded, see link that gives a comprehensive review of most audio capacitors available.
Mundorf Supreme Vs. Supreme SIO and SGO?
For those who've gone from Mundorf Supreme to Mundorf Supreme Silver Oil and/or Silver Gold Oil, what differences, improvements, etc. did you note? Oddly I can't find any info searching the 'net on this. Is bass curtailed and resolution increased with the oil versions? Is the base Supreme more forgiving? Etc.