I'm running Android 5.1, but here are some of the apps I use that should be compatible with iOS, too:
Google Apps (Calendar, Chrome, Drive, Gmail, Hangouts, Maps, YouTube, etc.)
Skype
Pushbullet (install Chrome extension and the app on your phone and you can send SMS messages from your PC)...
The C70 looks spacious and attractive. Reviews from Newegg are very good.
However, if you would like my recommendation, the Fractal Design Define R5 has a minimalistic design, is sleek, and is very easy to build in.
The RAM you have listed there is good. General guidelines for RAM is to choose...