Amazing Spider-Man #239 (Newsstand edition) NM+ (9.6)
1st Hobgoblin vs Spider-man battle, 1st full appearance of the Hobgoblin,
Amazing Spider-Man #361 (Newsstand edition) CGC 9.4
1st appearance of Carnage who appears in Venom 2, Let There be Carnage and is almost certain to show up in the MCU! Spider-man vs Carnage cover and story
Wolverine #154 NM (9.4)
Deadpool vs Wolverine cover and story! Rob Liefeld art!
Detective Comics #570 NM (9.4)
Batman vs Joker and Catwoman cover and story, Alan Davis art
Batman #451 NM/M (9.8)
Batman vs. the Joker cover and story, very nice issue
Batman #441 NM+ (9.6)
Batman & Robin cover and story, 1st Tim Drake cover and story, might make 9.8
Batman #441 (Newsstand edition) NM (9.4)
Batman * Robin cover and story, 1st Tim Drake cover and story
Batman #440 (Newsstand edition) VF/NM (9.0)
Batman cover and story, Tim Drake appears in cameo
Batman #368 VF/NM (9.0)
Jason Todd officially becomes Robin! Batman and Robin cover and story
Spider-man vs. Wolverine #1 CGC 9.8
1st appearance of Charlemagne, Death of Ned Leeds (the Hobgoblin), Spider-man vs. Wolverine cover and story
X-Men #201 CGC 9.8
Highest Certified1st appearance of Nathan Summers (as a baby) who later becomes Cable!
Transformers #3 NM (9.4)
Spider-man vs. the Transformers cover and story
New Mutants #25 NM (9.4)
1st appearance of Legion, New Mutants cover and story by Chris Claremont and Bill Sienkewicz
Sandman #8 CGC 9.6
1st appearance of Death, Dream's (Morpheus) Sister, Neil Gaiman and Dave McKean classic story and art
Wolverine #10 NM (9.4)
Pre Weapon X Logan vs Sabretooth story. Very cool.
Amazing Spider-Man Annual #22 NM+ (9.6)
1st appearance of Speedball! Spider-man, Daredevil, and Speedball cover and story
Sandman #8 NM (9.4)
1st appearance of Death, Dream's (Morpheus) Sister, Neil Gaiman and Dave McKean classic story and art
Captain America #337 VF+ (8.5)
Steve Rogers becomes the Captain cover and story!
Amazing Spider-Man #362 CGC 9.8
Spidey vs Venom and Carnage cover and story! 2nd appearance of Carnage