Build quality was the original reason why I departed from Apple after the 3GS. I had the original Iphone replaced once under warranty. My first 3G I spilled soda on, had it replaced out of warranty. My 2nd 3G had white screen flicker so I had that replaced. The 3rd 3G headphone jack stopped working. I took it apart and found a connector came lose. My 3GS just stopped working altogether. Couldn't restore through Itunes or anything. At that point I had enough.
So why would you buy a phone without a case? I think the 5 looks good but without a case paying apple repair costs? No sir....
I've gotten so many replacements for my busted evo charge ports its not even funny.