I always loved the 171 because of the silver seconds subdial and the silver power reserve. Goes very well with the shiny bracelet. The combination of titanium and steel is very nice. I also think the old style of the bracelet is more unique. So, I was very happy to get one.
104 is nice, but in my eyes the 171 is very special. I also have the 88 and the 190 to have a broader range of different styles.
So, if you really like the 171, you better wait...
Frank.