If you're looking for Porcupine Tree on good acid try: The Sky Moves Sideways or Voyage 34.
Otherwise I'd say FOABP is a good starting point. They have been getting heavier as time goes on. Deadwing has some heavy moments and FOABP is even heavier.
I'd recommend their live album "Coma Divine" . It's absolutely stunning and probably my favorite live album of all time. No exaggeration. Great production, deep tracks from their early work that fail to get mentioned, it's a must have.
Originally Posted by Satanstoenail
Amazingly I'm able to appreciate that Seinfeld is awesome and that Belligerent's car is bitchin without my head exploding.