I'll readily admit to liking the cinq vis concept, and the Stronglight 49D in particular. It has this angular vintage French industrial look while being one of the lightest cranks ever. I always keep an eye out for them, and manage to find just enough to feed my habit.

More often than not it means buying a bike, or what's left of it, like the latest set I found a couple of months ago. Luckily this one came attached to a rather nice frameset: