Well, Teetering Peaks offers (potentially) one more point of damage, but the new one offers so much more survivability. There will be situations when each is preferable, but I don't think it's an entirely clear-cut comparison.
Is the black one not remotely functional as a Volrath's Stronghold impersonation?
Is the red one too narrow and tempo-lossy for a red deck? It's not sooo different from Teetering Peaks, which gets play over here.
Angel has resolved a lot over here. It's kind of a top-end in a removal heavy UW or Esper control deck most of the time. But ideally one that also plays stuff like Baneslayer Angel and other creatures so that when Serenity hits the board you'll have already soaked up their removal spells.
The other four look great.
Play Sandstone Bridge, give Knight of the Reliquary vigilance. Attack. Sacrifice a land mid-combat to pump KOTR, grab Looming Spires to give it +1/+1 and first strike.
Well, the one thing I was thinking of was Scry abuse. But... I don't know, I guess you scry what you want to the bottom and then exile something from your hand? How does that exiling work with the new eldrazi?!?!?