If you haven't got a 'luxury' watch yet, I'd say get that! Have a look at some nice classic sports rolex models, like a GMT 2 or a Submariner...they're proven models that have been around for over 50 years. Also would be nice as a gift to pass on to your children, if you have any, in the future as well. The values generally hold up well for the more popular sports models.
I'm quite a watch enthusiast and I can tell you I get as much enjoyment from nice watches as I do from nice cars. Definitely worth a look at getting in to in my view.
2010 BMW e92 M3 M-DCT (Frozen Grey/Black)
2007 BMW e92 M3 6MT (Jerez Black/Palladium Silver) - Sold
2002 BMW e46 M3 SMG (Titanium Silver/Black) - Sold