I saw them live twice with LCD soundsystem. Was awesome. Especially considering I was next to the stage both times. Although I was disapointed a bit with LCD Soundsystem's studio album...it felt really...cold. Still I like it ok, but prefer them live.
As Far as Arcade Fire goes, I hope they continue making excellent albums that I can spend my money on.
*bump*
i havent listened to them in a while
but aparently theres a DVD or something out mhmm [its a little confuzzling] and it includes fottage from the Neon Bible tour