I recently got the Shure SE215 earphones, and am now considering getting a USB DAC for my desktop computer after reading the hype (with eventual plans to upgrade to better earphones within 1-2 years); is it worth the extra money to get a DAC for the SE215? I should also mention that my...

I recently got a Roku 3 and absolutely love the wireless audio-broadcast to the controller and have been looking for something with relatively similar technology that's flexible enough to work with multiple headphones (one broadcast, multiple receivers); does something like this exist, or should...