i've been looking at doing the same thing...
i have 5v WS2812 flex strips I'd play to use... I'll use a Pi with a USB/RS485 dongle and uSC to drive the strip and wifi to update sequences and manage the Pi... a single 5v power supply can drive everything.
Soon, the Captain should have the ability for the Pi to directly control the strip, so the uSC and USB dongle will not be required.