After Blackgates... which caps are best for Audio?

I don`t believe Duelund is a "film" capacitor as mentioned above.To my understanding they`re pure metal foil and PIO(paper in oil) for the VSF and CAST versions. Not sure about their lower cost Alexander caps. The main obstacle to using Duelund is very high cost as Bhobba states above.I`ve yet to read of anyone disappointed with their performance after purchase.
Regards,

Elna is pretty close to Blackgate. Have been vey impressed with the F&Ts. Have used Obliggatos Golds in place of electrolytics in crossovers

Where do you want to put them? Dac Board? Power Supply?

http://www.soniccraft.com/black_gate_capacitors.htm