Funnily, Rococo is one of the tracks I wouldn't lose. The weirdass Radiohead/Cocteau Twins/The Cure acid trip sonic density going on they do there is cool. I'd personally yank both Half Lights, The Suburbs Continued and Wasted Hours. Maybe Sprawl I, but I hesitate on that. I feel cutting Sprawl I would cause the loss of Sprawl II by default, which blows because Sprawl II is gorgeous and gaudy like only Arcade Fire can be and I will take any opportunity to hear Régine taking the helm of a song I can.
Speaking of which!
Arcade Fire - Sprawl II (Mountains Will Be Mountains)
EDIT: Also, agreed on the assessment about The Suburbs being a nostalgia trip. I'd also add that it has a very contemplative, somber mood that mixes in with colorful undertones. Very intriguing result, and worth studying and deciphering.
EDIT 2 (I am Grefter's ex-wife): I believe God himself passed down that the heaven-touched pop masterpieces last somewhere between 40 and 45 minutes, 50 at the very most.
EDIT 3 (holy shit I have nothing better to do): Suburban War is quite good, yes. I think it's hurt by being slammed in the middle of the most poorly paced lump of the album, though. But for other music:
Arcade Fire - The Suburbs
I could listen to this song on repeat for -years-.