.....there is something quite magical about the perpetual calendar complication. At the same time, the split second chrono is an incredibly cool complication. Yet, to my mind (at least at the moment), combining the two results in something which is less than the sum of the parts. Now, I know that I will be in a very small minority with that view, but to my thinking the purity of the split second chrono is best served singly and not in combination with the romance of the perpetual calendar.
No question at all, the 5204 is an absolutely stunning watch. But if push came to shove, I would be quite torn between 5004 and 5204....and of course if i wanted just pure chrono rather than split, throwing in the 5970 in the mix makes it tough. But, like Kari, i see the purity of the 5370 as King.
If i had to choose between all these.....well, that would be a superb problem to have!