First of all,
to BreitlingSource.As you very well stated, the ultimate decision is yours to take and what anybody else thinks is totally irrelevant.
Having said that, any Navi is considered a classic piece, even if we see the World less around, so it will last a lifetime, provided it has the care it deserves. There is no way it will look outdated in 10, 20 or 30 years, it will be trendy forever. And it is not flashy.. Now, as for size, only you can be the judge of that depending on how you feel the watch on your wrist. Obviously, if you have a small wrist, it will show a little big but if you found the normal Navi too small, don't think about it.
As for strap/bracelet options, they are nearly limitless with Breitling. If you choose a calf or croco strap, the World won't be less flashy, it will have a completely different look. A croco strap will make it stand out much more than with the bracelet. It also makes the watch more dressy but that is my personal opinion, so forcibly biased as I am a strap man. Make sure to choose a deployant strap, though, it will be more comfy, safer and it will make the strap last much longer than a tang type. If you ordered the silver face, an awesome combo will be with a gold strap.
And do post some pics when you're done.
