Your favorite sounding album?

This is easy, Dark Side of the Moon.  It sounded amazing back in the 70s and still does now.  Just compare it to other 1973 albums, the difference in production is incredible.  Floyd always had amazing attention to detail and the pride in their sound has stood them well.  DSOTM was way ahead of it's time.

I also agree with those who mentioned Red. If I was going to put a lot of money into buying just the right guitar, I'd like a similar sound to what they have there on certain parts.

Master of Time wrote:   I can not stand the sound of Alex Lifeson's guitar anymore, I really hate it. I really don't know what about irks me so but something about it I just don't like. I did think it sounded better on their recent single Headlong Flight though which I quite enjoyed. Besides that though I can barely listen to Rush at all anymore.

 I'm not sure what the intent of the OP was. The sonic quality of the album or the musical ambiance. But what first cam to mind was Tresspass by Genesis. The laid back melancholy slightly spacey and mystical feel permeates the whole album for me. I have always hated the poor production value on it though. Now However I have a remastered 180 gram vinyl and that poor production and bad mixing and crappy vinyl problem are fixed. Yay!

 Others I agree with but already mentioned are Amon Duul II Wolf City.  It's just got a plain rock n roll sound that Euro bands can rarely muster but it adds a nice  surrealistic edge that I love. Olias of Sunhillow... its like being in a trance and projecting to another realm to listen to this thing.. exactly what music is for eh?

Red. A great balance between heavy rock power and prog rock exquisiteness.

I like the sound of Rush's "Moving Pictures" too.  A very wide, panoramic sounding mix with good low end and a nice high pop on Neil's small tom drums.  Lifeson's guitar tone is really heavy too, but not too distorted.

I must add Red to my list, it's maybe the best natural sounding album I have ever heard, drums are not manipulated but has a very natural sound, perfect mix overall.

One of the better sounding albums in recent years is 'The Art Of Navigating By The Stars' by Sieges Even, this is really huge, clean and distorted guitars have a great sound and are perfectly mixed together, except that, snare and bass drum are so powerful, one of the best i've heard, a real masterful work.

Elbow - The Seldom Seen Kid

Three albums that I don't like to hear because of their sound, although musically interesting
King Crimson - Lark's tongue : recorded too low, noisy
Yes - Relayer : too metallic, percussive and aggressive
Anglagard - Hybris : drums are too loud and aggressive.
Jethro Tull - Aqualung : too bad that sound deserves such excellent music.

I love the production of the following albums :
Gentle Giant : In a glass house
Camel : Mirage and Moonmadness
Hatfield and the North
Pink Floyd : Animals, DSOTM, WYWH, Final Cut
Jethro Tull : Passion Play and ... Dot Com
Porcupine Tree : Coma Divine
Yes : Close to the Edge and Magnification

Jon Anderson's Olias of Sunhillow has an overall sound quality that really hits me, and I cannot reduce it to any one single thing.  It is the combination of the tones, the production, the instrumentation, his voice, and of course the music itself.  I agree with Moshkito that El Greco by Vangelis has superior sound.  On surface, it all seems very simple, but like the sea it emulates in so many ways, there are subtle depths to the sound that give the album its amazing aural depth.