X-Men Schism #4 & #5
Just read them back to back.
Issue 4: HOLY EFFING SH!T!! No way are we coming back from what Cyclops said to Logan.
Some knives get buried way too deep and I don't see Wolverine ever completely forgiving him for that.
Issue 5: Battle royal between Cyclops and Wolverine. And even though we know how it's going to wind up, Jason Aaron does a great job getting us there. I'm really looking forward to his Wolverine and the X-Men series even though I can't stand the artist.