Dave,
may I show you my own networks for a 4430 clone project that I built two and a half years ago:
http://www.audioheritage.org/vbullet...ect&highlight=
As you see, I didn't use any expensive boutique parts, as I don't believe in capacitor sound (even less in the improvement of »charge coupling«). Instead, any capacitors are from surplus, and they were cheap. But they all are polypropylene or polystyrene, physically the best film dielectrics one can buy. I individually measured a large stack of capacitors and paralleld them to get the right values, where necessary. I opted for cored inductors for both the bigger values, bought the next higher stock values and unwound them to the right inductance, using my DeRee DR5000 component tester (i.e. 2.7 mH -> 2.6 mH, 1.8 mH -> 1.6 mH, and 50 µH -> 40 µH, respectively).
Especially for the big LPF inductors I chose the ones with the smallest DC resistance that I've found, due to reasons already mentioned in this thread. I didn't find air cored inductors with DC resistance that even approached the onesI used (0.11 ohms).
Finally, it is very important to orientate the inductor axes perpenducularly to each other, see my pics.
Best regards!