Kwak Clock parts

[John Swenson]

I'm building some USB DACs to try out different USB chips and DACs and have decided to try a Kwak Clock,but I have some questions on some parts:

2.2mH inductors

there are hundreds of 2.2mH inductors out there, any idea what specs I need? The range from a DCR of .04 ohms which is a 2inch toroid to a axial lead one that looks like a 1 watt resistor with a 60 ohm DCR, and pretty much anything inbetween.

Crystal type

I can easily get the either AT or series crystals in the frequencies I need. Would a series cut crystal be better? ICM makes low phase noise crystals for $19 in singles, would these
be any improvement?

Thanks,

John S.