In semi-random order:

Babe I'm Gonna Leave You - Led Zeppelin
That's The Way - Led Zeppelin
Thank You - Led Zeppelin
The Rain Song - Led Zeppelin
Analog Kid - Rush
La Villa Strangiato - Rush
YYZ - Rush
Jacob's Ladder - Rush
Freewill - Rush
Wait For Sleep - Dream Theater

Well for me this would change as often as the wind blows (and my mood changes) but right now here's what comes to mind:

1. Firth of Fifth _ Genesis
2. Echoes_Pink Floyd
3. Super's Ready _ Genesis
4. Close to the Edge _ Yes
5. Cinema Show _ Genesis
6. Fountain of Lamneth _ Rush
7. 2112_Rush
8. Carpet of the Sun _ Renaissance
9. Shine on you Crazy Diamond_ Floyd
10.Nuclear Apathy_ Crack the Sky

I'm sure I missed something.....

here's mine :

1. Pink Floyd : Echoes
2. Jetho Tull : Thick as A Brick
3. Camel : Ice
4. Jethro Tull : Moths
5. Yes : Run Through The Light
6. Caravan : The Love in Your Eyes and the rest of it
7. Camel : Lady Fantasy
8. Caravan : For Richard
9. Pink Floyd : Shine On You Crazy Diamond
10. Yes : The Spirit of survival (maybe it's too fresh and I'm too too influenced by it!)