I've been using a straight razor exclusively for the past 5 years and never want to use anything else. The initial cost is high. I spent $120 on the razor (a Dovo), $30 on a high-quality strop, $30 on a high-grit hone, and $80 on a lower grit diamond plate. However, unlike the DE which I used to use, I never have to worry about buying blades again. As long as I don't break/lose anything, this setup will likely last the rest of my life. I also like how there aren't any disposable parts. I usually hone it once or twice per year and don't need to do any more maintenance. A DE may still win in ease of use and total lifetime cost, but the straight razor is way more fun!
Besides, my SO thinks I'm a badass for dragging an open blade across my face :P