100% Neal Morse and Steven Wilson. Roine is a great composer but imo not as great as Neal and Steven, and also he is (don't kill me) a very mediocre guitarist (okay, so is SW, but he doesn't present himself as a lead guitarist.)
I think, the secret to SW is to check out his stuff beyond Porcupine Tree and his solo work. I am currently listening to a LOT of ambient and man his Bass Communion stuff is just utterly beautiful. I know the first two albums only, and they are gorgeous. Also, Storm Corrosion and no-man are amazing. no-man's Together We're Stranger is one of my favourite outputs of Steven's (and it's opening builds on a Bass Communion song, and it's beautiful as to be expected).