Hi, I've been thinking of upgrading my hifi system a bit and am wondering if anyone has any experience, with regards to useability and sound quality on the following options I'm thinking of. I'm currently using a Brennan JB7 for my music through a Nad C356BEE amp connected to a pair of B&W 683 speakers. The Brennan only allows for mp3's and I'm thinking of upgrading it for either a Cocktail audio x30, or a Bluesound Vault with the addition of a tablet, as they both support WAV and FLAC. I have noticed that both of them do not support Spotify which seems a bit strange as this is one of the most widely used streaming services, but am hoping they come up to date soon. I'm looking for something with a very good sound quality without the inclusion of a computer. They both seem to have good DACs built in but if I were to connect either one to my existing nad amp, would this bypass their DACs and how would this (if at all) effect the sound quality? If anyone has any ideas or experience on these two divices I'd be grateful if you could share them.