The Chronotronix IN-18 Nixi Clock is just the salve for your retro-modern time keeping hurt. This beauty is made from vintage Nixie Tubes like those used in old science equipment (for displaying scientifical data...) and even early calculators. Having gone out of production in favor of LED displays back in the 70's, there aren't many of them left in the world.
There are a number of kits available all over the web so if you are so inclined, have at it. If you want a minimally designed finished product that you can set up right away, Chronotronix has a gorgeous clock ready for you right here and now starting at the [high] demand-influenced price of $309 (for a V300-TEL Nixie Clock).