Of material that is "really" available and I own, I have chosen books I go back and re-read quite often...
1. The first Batman collection of annuals.
2. Superman from the 30's to the 70's
3. The Challengers of the Unknown Archives #1
4. The Challengers of the Unknown Archives #2
5.  Little Lulu Dark Horse volume #1

Material that is NOT available, but that I wish was available...

1. A collection of Dennis The Menace Christmas Specials
2. An  Archive set from Real Screen Comics
3. A Mystery In Space Archive
4. A Marvel Family Archive
5. Rex The Wonder Dog Archive