I think it's important to a draw a distinction between comic (which are mostly serial) and graphic novels (which are mostly contained). On occasion I revisit some of the older ones and my fascination hasn't faded yet, I do need to be in the right mood though. I think V for Vendetta is another good one if you like the more rebellious stuff (and the artwork is amaze) :)
I do love Xmen too, but I prefer the more noir Wolverine stories :)