I went with the proclip Iphone holder. It can be a little pricey (around 100 bucks total I think) but it works very well. You can get it where it'll hold just the iphone or a iphone and case. vertical or horizontal view as well and if you want to install it on the dash or the vents. You can also get the option to hard wire the charging cord. I went with the one where I just plug into power source.
Here are pics of mine: