I need to try DVD-A, any recommendations?
DVD-A has made a little bit of a resurgence with the new remixed releases from Steven Wilson (must be a better licensing deal than Blu-ray). That said, almost all of the older ones (and newer, as well, I guess) are available as high-res downloads from HD Tracks, et al.
They are nice for multi-channel playback, if you have a surround system, as are newer Blu-rays and multi-channel SACDs.
Roon is going to support 5.1 playback in its next release; for example, connecting my MacBook via HDMI to my surround receiver. I've done this with Audirvana and it's fun to experiment, as I've ripped my entire collection of DVDs, DVD-As and BDs into multi-channel FLAC files. I am looking forward to the software update from Roon.