When Lifetime played 930 last summer, the club took out the barrier and turned the place into an intimate club for the first time that I can remember.  THey allowed stage diving, and the dance floor was huge, and the place was pretty packed.  That was a great show.  If I was seeing a mellow band, I would love to see them at the Black Cat; its a great venue with a great feel to it and from what I could tell, decent sound.  
 
 By the way.  World Inferno was mind blowing.  I can't remember hte last time I was that into an opening band.  The friends I was with hated them; I couldn't have loved them more.