Pls do not fall victim to the infamous PC Magazine "keys" test. ...Yes, the iPhone is pretty scratch-resistant, esp in comparison to previous iPod's. But I've read too many sad accounts from devastated people who either scratched their cases, or screens, or just dropped their iPhones and shattered the glass... And if you ask me, the iPhone is like a bar of soap, albeit a beautiful one. If you aren't careful it can flip/slip out of your hand and obey the law of gravity... 😟 It may survive the trip unscathed, but then again it may not...
I share your desire to not hide the beauty of the device. But, I would urge you to use a minimal case, and keep the whole assembly in some kind of protective bag. Although I keep my iPhone in a Vaja Top Holster (covers the screen when not in use), my nieces use the straight 'Vaja Holster' that hides nothing (i.e., doesn't detract from the device) and really complements the phone. But they keep them in Vaja leather bags when stored, so that they don't get easily scratched.
http://www.vajacases.com/home/home_en.html
Unfortunately, Vaja is the only case I know of that holds the iPhone in this minimalist way. It is not, I repeat NOT a bulky cover... Now, if you aren't up for the cost, perhaps someone else could chime in with another alternative...
Hope this helps... 🙂
Good luck.