If you are going to build the S7's, do yourself a favor and go straight for the Jantzen wax/paper/copper foil inductors. I also prefer the ClarityCap MRs bypassed with Jupiter copper foils. Both caps are great, but the real magic is the Jupiters, IMO. If you can afford it, just get Jupiters as your full sized caps and forgo the CarityCaps (or Sonicaps) completely. Jupiters are so good, they do not need to be bypassed, if you use them as your main caps.