By Alex Lauer A $25,000 titanium and carbon fiber chronograph, a limited-edition rainbow wonder and a heritage revival watch that pretty much sold out instantly — these are just some of the timepieces that Swiss watchmaker Zenith has unveiled this month. They’re celebrating LVMH Watch Week, where family brands like Hublot, Tag Heuer and Bulgari are showcasing their latest and greatest, and there’s a whole lot of wrist candy to digest. But we’d like to draw your attention to a simple three-hand model. Deceptively simple, we should say. We’re talking about the Zenith Defy Skyline, which is power…