Buy Torchlight II, it launches 2 days before Respawn V25.
It's an all killer, no filler Diablo style game from dudes that helped create the first 2 Diablo games and includes LAN co-op.

Probably a good intro as any to the game:
http://www.youtube.com/watch?v=I6exWP9632k

It's on Steam. $20 or 4 for $60.
Who's interested?

Already paid and waiting.

Also Borderlands 2 will be release before Respawn V25.

It has released and is glorious!

Is it only 4 player local co-op?

6 player! You better believe it.
It's a bit weird when there's only 4 classes, but the different class spec trees take care of that I guess.

Very nice, I think I'll buy it and join you...