The more I look at the renderings, the more and more I fall in love with the Pelli design...its subtle, elegant, detailed, and...beautiful...
arghhhhh It s amazing. I'm liking SOM more too (A LOT), but in my opinion it kinda screams, "LOOK AT ME I'M CUTTING EDGE AND CRAZY AND BOOOOOOLD BOOOOOOOOOOLD!!!!!!" and it's, in my opinion maybe a little much, when you take into account SF's past skyscraper phobia and the fact that it will be SO visible. I know the anti-"manhattanism" and NIMBYism is declining greatly, but it's not gone yet, and unfortunately I see a tower such as the SOM one possibly creating a backlash...more so than Pelli. As for Rogers' that one's out of the question, if you ask me.
I think we gotta save the really crazy tower for Piano's project, after we get everyone used to the fact that we're gonna be having some big buildings coming their way...