Though I shouldn't trouble the waters with any K2 speak, let me just say that the Japanese K2 (as there never was a domestic edition) of In Action is awesome, both musically (of course) and sonically. I got mine from Hiroshi (1800¥) and don't regret it for a moment. It's a great record — with great cover art, incidentally.
The Messengers date with Monk is also a good recommendation. I don't play that one enough. The Penguin Guide gives it a crown, and it's well deserving of one. I think Johnny Griffin understood/gelled with Monk just as well as, if not sometimes better than, Charlie Rouse.