Porcupine tree is great. I would also recommend their earlier albums like The Sky Moves Sideways (Example: Dislocated Day http://youtu.be/aR4JpRXDtKY) and Signify. They are more psychedelic than their late editions, but I like that.

Stephen Wilson is also involved in a lot of side projects, which is well worth taking a look at. Storm Corrosion with Mikael Åkerfelt from Opeth is Excellent. He has also released a couple of solo albums. His latest, Grace of Drowning (example: Remainder the Black Dog http://youtu.be/MMZ98XHyKYg) is a favourite of mine. And another one is coming.

Pibbur who has considered going up a downward escalator