Hi Ferentix,
Recommendations:
Spock's Beard - "Snow", "V", "The Kindness of Strangeness" and "Feel Euphoria" (uneven, but very strong in a lot of places)
The Flower Kings - "Unfold the Future", "Stardust We Are", "Flowerpower"
Pain of Salvation - "The Perfect Element", "Remedy Lane"
Gong - "Angel's Egg"
some more recommendations:
Indian Summer - "Indian Summer"
Raw Material - "Time Is"
Bubu - "Anabelas"
Gentle Giant - "Octopus", "In a Glass House", "Three Friends"
Catapilla - "Catapilla"
King Crimson - "In the Court of the Crimson King", "Red", "Discipline", "The Power to Believe" (just to give you a taste of what they're capable of, IMO this four is as representative of them as you can get with such a band)
and Dream Theater (yes - listen and decide for yourself) - "Images and Words", "Awake" and "Six Degrees of Inner Turbulence"