Magnification is great - highly recommended. I haven't gotten into The Ladder as much, but I haven't given it a good listen yet either. As far as live stuff, I've never liked Yessongs all that much, sounds a bit muddy compared to the albums. Yesshows, however, is fantastic, and covers my favorite period of the band - Tales through GFTO in superior live renditions. The Keys to Ascension sets are recommended primarily because of the great live sound you get with a (relatively) contemporary recording. The performances seem a little slower and "heavier" than prior live versions (e.g. Close to the Edge is closer in tempo to its studio counterpart than other faster live versions I've heard), which to me is a good thing, but others may disagree. As far as the Keystudio material, I think it's ok. I like the fact that they went for the epic-length tracks, and those certainly have their moments, but they're not on the level of their early epics - how could they be?