Unfortunately, if you want a full recording of Sunset Blvd. with a Joe Gillis that hits the note semi-solidly, Alan Campbell is your best bet. My favorite recording that's available would be the American one, because if you cut your losses (Glenn Close screaming her lungs out on Norma's songs), it's really the strongest and most cohesive of the three. My favorite recording ever was the four track German cast with Daniela Ziegler as Norma--she was just fierce, particularly in The Perfect Year. Sadly, I lost that recording a long time ago, and it's not available anymore!
"Peace! The charm's wound up."
--Macbeth