Hard to argue with Floyd also Steely Dan's entire output is great musically and in terms of production,the MCA remasters from '99 onwards are superior to the previous CD versions.
Early Roxy Music stuff too now available on HDCD.
David Sylvian's recent Everything and Nothing compilation.
Also the Queen early stuff still stands up.
PJ Harvey's Songs From The City,Songs From The Sea-great modern rock recording.
Most old Jazz recordings sound great due to the simplicity of the actual recordings, most things by Miles,Coltrane,Mingus and Monk etc.
There are too many great recordings to isolate into 5.
Ben