My system is a Rotel A11 Tribute amp, Marantz CD5001, Focal Aria 906 and Yamaha WXAD-10 streamer. I am thinking of an upgrade and I can either change my streamer for a new ifi zen stream and a Denafrips Ares 2 DAC or add a Rel 5 Tx (...or 7Tx) and leave the streamer-DAC upgrade for later. Which do you think that will have the most audiable benefit in my system ? Which route should I take ?