I used a Tigra iPhone holder when I toured last summer. Very waterproof and sturdy case, no issues with it. Easy to mount to the bars and can disconnect the case from the mount
I've used the Topeak Ridecase for 18 months now. It is very good. I've also got their powerpack, which means you can run Strava and Topeak's own Panobike apps at the same time all day without running out of power. Nice.
I think they're releasing a new ridecase that also charges the phone as well.
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http://mashable.com/2012/08/27/iphone-bike-mounts/
I quite like the 2nd option: The Joy Factory StormCruiser but I think it's only available for iPhone 4/4S...
http://www.alimaysports.com
I think they're releasing a new ridecase that also charges the phone as well.