Only because no one else has said it yet: Neal Morse, he plays keys, guitars, and even drums, and has an amazing voice.
The man has written/recorded/released/performed SO MUCH music in the last 18 years, between 6 Spock's Beard albums, 8 solo albums, 3 Transatlantic albums, a ton of live albums with all of them, and even more guest appearances on many other's albums.
Also, props to Steven Wilson.
-Marc.