Change default file manager in Arch Linux with E17 to Dolphin

I am using Arch Linux with E17 as my DE. However, I am not happy with the file manager that E17 comes with, so I researched a bit and decided to go with the Dolphin file manager (the one KDE comes with). So I need the following info from the experts: - What's the best place to get it from? Official packages? AUR? If yes, which, if no, where and how? - And, of course, how to make it the default file manager so that it gets launched instead of E17's file manager.