Blue is a classic for sure, and I'd agree, find the LP if you have a rig. I made a comment similar to yours about the CD in another thread and had several folks jump down my throat saying that the CD was an outstanding one on their players. I think there was a 20-bit version of it at some point. And yes, Joni Mitchell is truly an artist...wonderful stuff...I've been a big fan for a long time. Blue would have to be my favorite of her early stuff. A close second would be Court and Spark. I think I wore those two LP's right through! Her recent stuff is quite different, and I haven't been as hooked by any of them. There is a great live double album too that is a must if you like her stuff...Shadows and Light.
Marco