Here is another case that lets you do more with your Raspberry Pi. The Argon x NanoSound ONE is a Hi-Fi DAC case with 192kHz sampling rate and 24-bit resolution. It comes with an infrared receiver, remote control, and an app. The NanoSound player runs an open source audio player (Volumio).
This case has an aluminum enclosure that acts as a heatsink for your Raspberry Pi. It gives you access to GPIO pins.