An awesome idea for a thread. Been following since it started up but didn't get round to contributing anything. Some great covers in there though. Can't seem to post pictures just yet but a couple of my favs are batman 465, amazing spiderman 300, superman brainiac and maybe some less popular choices are the variant to the new 52 batman 1 (I think it was by jim lee), and Todd mcfarlane's spider-man 1. I remember seeing that as a kid and just fell in love with the image. Bought the issue and the poster right then and there in the shop.
In hindsight this seems like a worthless post without pics. Haha.