Best tip combo so far is comply 500's with the silicone "bore" shoved inside the bore of the comply 500. The silicone bore is from the included tips with the 64. I feel as if the length of the comply p series tips is too long and you lose more of the clarity because of that. The shorter length of the 500's is perfect and the silicone protects against the foam eating up any frequencies.
This is for the SM64 btw.