These are good looking...but expensive. Not sure what their impact on reception is for the ip5 models either...did a review of their ip4 phones and was not impressed. Build quality was nice and all that, but it absolutely obliterated reception... http://exovault.com/iphone-5/
This question is funny to me because it's like asking what frames look best for your photos. The photo is the main event. A frame that's too obtrusive just detracts from the photo itself.
So I tend to go for cases that provide minimal protection (i.e., if I throw the phone in a bag or in my pocket, I don't have to worry about the phone getting scratched up). So far the only case I've found that fits the bill is the Caudabe Veil. And the price is cheap enough that if one breaks I can just get another.