I'm unwilling to fly a single conversion receiver which leaves me with one choice for PCM, the JR R945S.
Poor Rx designs, especially the cheap park fly type, have given the SC Rx a bad rap.
JR's SC models are very selective and are great performers. Do not confuse them with lower quality designs. Their ABC&W circuitry is very effective and the Rx's front end is well designed.
This white paper is good reading:
http://www.bergent.net/SC-DC.pdf