Arkham Horror: Beautiful illustration, as well as a beautiful game in my opinion.
MtG: Magic cards remain among the most polished and beautiful ever created, even if I hate the direction it has taken, and in general I appreciate competitive games less and less in favor of more collaborative ones; in fact my favorite way to play Magic is with the Archenemy format (there is also an excellent boxed product).
Marvel Champions: I don’t actually have this in my collection but it looks pretty cool, I have to admit I’m quite a fan of Fantasy Flight Games at the moment!
I’m sharing my current favorites here: