The Ram Aquabox is nice, but for me I use my phone as a GPS (yes, btw it does suck for that) and that function
eats the power like nothing else. I would need it powered so it doesn't die on me (it has before). So, I pretty much
came up with my own powered iPhone box for less than the Ram box:
Drilled a hole, cut off the phone end of a Powerlet charging cable and soldered on
the smallest charger end I could find.
Mounted a Ram ball mount on the back side, and used Ram hardware for the rest
of the mount.
Pros: Keeps phone dry, and protected. Can still see the display.
Cons: Bulky, can't manipulate the display, gets HOT when charging. I've had the
phone shut down several times this summer due to the heat while the power cord
was plugged in.
So, I ended up getting a Ram X mount & extra powerlet cable for the hot/dry days.
I carry this one in my top case for when it rains.