It's just crazy that they want to move by next season. How is that going to work with a dual-team plan? In any event, I agree that Carson seems like the fairest deal, though the Rams have a legitimate claim to LA and could get the spot if they have a more solid plan in place.
The question very much is what would the Raiders/Chargers do if the Rams get the spot? They might BOTH have to relocate out of CA, which seems like a worst-case scenario, though an LA/SF rivalry does sound pretty awesome. I guess the Rams could come in and grab one of the other teams to partner for their stadium (which would make conference alignments easier). If that happens, St. Louis jumps to the head of the line to grab the other (as they have a new stadium plan in place and an old one that just hosted games), though I guess SA might still have connections to Davis.