What a question! OK, let’s deal with this logically. Immediately I have to rule out anything super rare or valuable, give that I’ll be wearing it every day, and by the same token I’ll rule out precious metals. I also wouldn’t want something too safe or conservative, as I’d get bored. That said, it needs to be stylistically versatile. Of course some horological credibility is required. Based on all this, I’d have to opt for the titanium Perpetual Calendar from Ochs & Junior.