Here is my list for Songs/Albums that i would pay for in Rock Band! ( Well All but that would prob be impossible! )

1 - Blizzard Of Oz ( I would love this whole album for DLC, )
But if i could only get three songs from it i would go with -
1. I Dont Know
2. Crazy Train
3. No Bone Movies.

2 - Diary Of A Madman ( Whole Album MUST HAVE ! )
Again, if i could only get three -
1. You Cant Kill Rock and Roll !
2. Flying High Again
3. Diary of a Madman

3 - Bark At The Moon. ( Yea Whole Album! )
If i could only get three -
1. Bark At The Moon
2. Your No Different
3. Waiting for Darkness

4 - The Ultimate Sin ( Pick My Favorites from this a 4 pack if you will )
1. Ultimate Sin
2. Lightning Strikes
3. Fool Like You
4. Shot in the Dark

5 - No Rest for the Wicked ( Another full album must have for me! )
If only three then -
1. Demon Alcohol
2. Crazy Babies
3. Miracle Man

6 - No More Tears. ( A 6 Pack ! )
1. Mama I'm Coming Home
2. No More Tears
3. I Dont Want To Change The World
4. Hell Raiser
5. Zombie Stomp
6. A.V.H.

7 - Ozzmosis. ( Three Pack )
1. Perry Mason
2. I Just Want You
3. Tomorrow

8 - Down To Earth ( Love the Darkness of this album! )
A three pack
1. Black Illusion
2. Gets Me Through
3. No Easy Way Out

9 - Black Rain ( Another 3-Pack )
1. Not Going Away
2. Black Rain
3. I Dont Wanna Stop.

There are also many Bonus Songs that are not on any albums that i would love to have.
I will leave that up to any one who wants to post them. ;)