Prog Rock.....Porcupine Tree?

Waszawa is a great starting point,has I believe three songs from Lightbulb Sun. The price for Lightbulb Sun on CD or Album is outrages on ebay although I have seen some japanese imports on Ebay going for twenty dollars. Wait because it is being re mastered and released this year with extras.
Another prog band you might like,it has heavy influences of Porcupine Tree and Pink Floyd is a new band out of Poland called Riverside. Try their new offering Rapid Eye Movement.

Fear of a Blank Planet is different than their early offerings. If you like this offering then pick up Deadwing too because this is where the band turned in that direction of shorter songs with more hard rock influences. They have a best of the Early years and the remaster is great. Check it out,it is more Floydian than their current stuff.