Definitely has to be the vinyl track-order of FOABP, which included the Nil Recurring EP. Such an amazing collection of music, and it all fit on a single CD-r! Although I recently discovered the tune "Always Recurring", which was a sort of precursor to "What Happens Now?" which includes some themes and motifs and even lyrical ideas that would make the final song, but the piece ends with the same looping sound effects that open "What Happens Now?", so I've used it as a sort of intro to WHN, and it's an amazing way to close the album.
FOABP was the first new album by PT after I became a fan (not long after DW came out), so it was very exciting for me. I even caught them at Ram's Head Live in Baltimore on that tour, and I *rarely* go to concerts like that, so that album and tour are pretty special to me.
Not far behind FOABP would be In Absentia, including the Futile EP and all related songs, though it would be hard to rank it 2nd considering I also really love Deadwing (especially closing the album with "Half Light" - such an amaaaaaazing song!!!). The Incident is nice, but it doesn't get as much replay value from me as the other three.
-Marc.