Some minor keys here, for your consideration.
Hitman #9 1st appearance of Sixpack
DC One Million #1 1st appearance of Solaris
DC One Million #4 1st appearance of Superman Prime
JLA/Avengers #4 Iconic Cover
Cosmic Odyssey #2 Destruction of Xanshi
Considering that Section 8 is the greatest team in the known universe (among others), i couldn’t pass the Hitman issue up.
For JLA/Avengers #4 you can say what you will, but i think it is most probably one of the greatest covers ever
I was divided regarding Cosmic Odyssey #2, but considering the destruction of Xanshi has been a constant in John Stewart’s story & the Green Lantern mythos in general, i thought i’d suggest and see what you think.
DC One Million #4 i believe is a no brainer, because Superman Prime always comes up in those “greatest Superman variants ever” lists.