I keep a WTB list and a Speedmaster is pretty high on it. There is no question that it is a cool watch and can be had on the second hand market for what I consider very reasonable prices. I hope to one day get one but the referenced Doxa Chronos are a different style that I am currently lusting after.
Longines also make a few Chronos that are just what I am looking for but I have another Longines watch, the Legend Diver no-date, on my WTB list so I'm not really looking at their Chronos. For no rational reason, I'm not looking to add more than one Longines in my collection.