Three years ago, I had no clue about computer audio. I got a used Benchmark Dac-2 with a USB input, and set to work doing research. There is a learning curve, but it really isn’t hard.
I would find a local dealer who sells Aurender, he can explain it all to you, help pick out the right model, and show you how to use your laptop for ripping, and transferring them to the Aurender.
Don’t buy anything that does not do hi-rez and DSD, you will find music that is only available as downloads, or by buying the download you are able to get the higher rez version. A good example of this is Jerry Garcia Band Volume 8. I was able to get the 24/88 download. That is just one example
Aurender, Antipodes, or one of the Brystons would all be good choices. Beware of small niche companies, if the owner dies, that might be the end of the company, so no more support or firmware uprades.
I have seen and heard the Music Vault, although in an unfamiliar system. I thought the operating system was more like a PC, than a strict music player.
If you are not in a hurry, PS Audio is working on a music player that will output I2S to their DACs. I don't know about price, but it should be a very good piece, and I think it will include a transport for ripping.
If I read correctly you have four systems, are hoping to play on all of them? That would require a network accessible player. Do you move the laptop around to the other systems?
If not, an Aurender in the "100" series will be ideal.
I would buy an Aurendert, or wait for the PSA player, if my budget allowed.