Interesting build.
I have a CAPS 3 Lagoon that I've been tweaking on for a few months. It's perfect for my needs as I only use it for music as intended. I control it with JRemote on my iPad, which leaves me wanting for nothing.
A couple of weeks ago I decided to try JPlay 5.1. I've tried JPlay in the past on a CAPS v2, and didn't like the sound nor the extremely clunky interface. JPlay 5.1 is a revelation for me now. It's almost transparent integration with JRMC is a HUGE improvement, and so is the sound. I haven't purchased JPlay yet, but I plan to as soon as I can determine its best settings. For my setup, JPlay delivers incredible clarity and image focus. So much so, I don't think I can live without it.