For some the answer is none. For me it's the Maris MVP card, I just love the way he pops against the red background.
As I've put this set together I like it more and more. With several great subsets and tough high numbers I've really enjoyed building this set, plus the card stock used must have been really good because there seems to be more readily available quality condition cards in this set than any other I've completed.
Not my card, can't get mine to upload.