My wishlist isn't too diferent than others, but here you go. I date myself to the mid-late 80's as my prime collecting time. I had a hard time keeping to 5
1. Iron Man by Michelinie/Layton
2. Avengers by Stern
3. ASM by Stern
3. Cap by Gruenwald
4. Web/Spectacular Spider-man Vol 1
4. Marvel Team-up
5. Hulk by PAD (would be higher, but I have the visionaries)
Others thrown out that I like is the Namor by Byrne and continuation/collection of several modern runs (x-men and cap for example)
Reprints I want to see that I missed the first time is Uncanny (if I had it volume 2 would be on my list), basically all the OOP Daredevil ones, FF 2 and Ultimates.
I've said it before, but I would buy an omnibus of many of the things that that have come out in Essentials. I love reading those and actually don't mind the black and white, but you still can't beat the omnibus.