I'm thinking I don't have much of a choice since my wrist is 195mm around and 60-65mm wide, it's looking like the 42. It appears it will be larger than my current watch though:
https://www.jcrew.com/mens_category/accessories/watchesandwatchstraps/PRDOVR~27460/27460.jsp
This has a 18mm strap, and judging from the pics the strap for the sport watches will be much wider than 18mm.
Does anyone know the strap widths?
Golden ratio can be a useful guide for not having too big or too small a watch. Take your wrist width * 0.618. That'd be ideal "height" and you can go from there. If it was me, if I had anything over 38, I'd go with the 42, otherwise seriously consider the 38. For 60 it's kind of gray, but for 65? Pretty clearly indicates 42mm if you prefer to lean large.
There's no accounting for taste though, not really, and ultimately you won't REALLY know without trying them on.