It's easy for me to hit it all since I made an mp3 CD for the car, and since the only have four albums plus an EP, it all fits on there. My growing love for The Point of No Return is helped by it being the first song on the CD (the songs are on the CD in chronological order), so when I pop the CD in, I will always listen to that before skipping around.
Really, the only songs I never or almost never listen to are Darkest Light, Eternal Rain and Initiate. Those three stand out to me as the three weakest songs they have done. I don't listen to Nocturnal Conspiracy a lot, because for me to listen to a 13-minute song on a regular basis, it has to be damn good (at worst), and while not a bad song, it's not damn good.
At this rate, my 10 favorites would be:
The Point of No Return
Streams
Celestial Elixir
Deathless
Visions
The Path/Atlas Stone
Because It's There
Falling Back to Earth
Somebody
1985