When we talk about student-centered classroom enhanced by technology, we always start with "The Why" before ever considering the "How or How Much".
The new ISTE Standards for Students are a great foundation for "The Why".
I recommend that all educators take a look at the ISTE Standards for Students as they evaluate teaching and learning in their classrooms.
Simon Sinek's TED Talk: How great leaders inspire action is another great place to start thinking about "The Why".