Let's be honest, all of John's solos are either amazing or very impressive.
But one thing that always get's me is the sweeping in a couple of solos.
The "Voices" Guitar Solo really stands out for this, I love the way it builds.
And "Beyond this Life" has some badass sweeps in some interesting scales aswell.
There's definitely some more of these but I can't pinpoint which songs they're from right now. Haha
Live at Marquee has actually got some of the more impressive vocal work from James before he "broke" his voice in the Awake tour. It also has Labrie at the top of his game singing some When Dream and Day Unite stuff which is interesting considering When Dream and Day Reunite was cool and all but had similar mixing to Chaos in Motion which some people aren't too fond of.