I listened to some of the YES 'Fragile' and can certainly say GET IT!!!
I think I'll head over to DVD Planet and do some shopping!!! COC will be in the cart.King Crimson 'Eyes Wide Open' double dvd is great if you like their music. The cool thing about this dvd is it plays differnt improvs everytime you watch it, so it's like hearing a differnt concert each time!!! Their previous dvd 'Deja Vrooom' is also amazing and you can put any one of the 6 players in the center channel and all the others play around him. There's also a feature where you can pick different players from the bands career and listen to 21st Century Schizoid Man, as if they were playing together (example: Adrian Belew singing - Fripp/Lake/Giles rythm section - David Croos instrumentalist. Very Cool
Some of my other fav dvd concerts that have incredible sound:
Deep Purple - Bombay Calling & Austrailia '99
Dream Theater - Scenes From New York
Neil Finn - Sessions at West 54th & 7 Worlds Collide
David Gilmour - In Concert
Steve Hackett - Tokyo Tapes (all star line up)
Kansas - Device Voice Drums
Led Zepellin - double dvd with lots of concerts spanning their career
Megadeth - Rude Awakening
Metallica - S&M and Cunning Stunts (the stage destruction is cool, if you were in the audience and didn't know this was part of the act, you'd be freakin out)
Opeth - Lamentations
Overkill - Wrecking Everything (fuckin brutal and the sound is incredible)
Pearl Jam - Touring Band 2000 & The Showbox & Live at the Garden
Satriani - Live in San Francisco
Roger Waters - In The Flesh
The Who - Royal Albert Hall
YES - Symphonic Live & Keys To Ascention
I have a lot more but these are the standouts (along with the Rush 'In Rio' and Iron Maiden 'Rock In Rio' which you also mentioned.
DVDs that sound like crap and should not have been released until they got the sound right (and I was totally bummed these don't sound good):
Alice Cooper - Welcome To My Nightmare
Fates Warning - Live At The Dynamo
Iron Maiden - Raising Hell
Kiss - Live In Las Vegas
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yawn