My introduction to PT was In Absentia quickly followed by Sky Moves Sideways, so a bit of new and a bit of old. I then got Coma Divine and Signify.
Saw them live about four times, as and when they bothered coming to Manchester. I wish that I had now travelled further afield...
I then bought Deadwing as soon as it was released, and, following that, FOABP, Nil Recurring, and The Incident.
I also bought some more of their back catalogue including Lightbulb Sun and Voyage 34.
Don't have a favourite, such is the variation of each album... Depends what mood I am in...
Great stuff though and, as a live band, they will be sorely missed in our household (my missus is a big fan too).