Okay, I have read too many DAC threads; however, I like your direct question on what DAC you are leaning toward buying and judging that it is your systems weakest link. I cannot comment on your own judgement of weakest link. Let’s assume you are right on. There were two responses to your posted question that resonated with me. First, Mclinnguy (hope I have that right) recommended an upgrade to the Chord Quitest and staying within the Chord line of DAC’s. I have listened to and owned too many DAC’s to mention and be meaningful; however, Mclinnguy mentions the Chord TT2. This is my favorite DAC for sound quality and value. I have heard so many adjectives describing sound quality: soundstage and depth of sound. But I don’t understand how to put those to use. What I can put to use is: Does it sound like a piano, a drum, a steel guitar and etc? Can I place the instruments within the bands hierarchy? If the recording is clean is the playback as clean? Those are my main concerns when deciding on a DAC. The Chord TT2 ranks extremely high on my list and probably the best for the money (not inexpensive). I also own the Cord Quitest and Hugo 2. Both are very good pieces based on my parameters. In my opinion, neither provides the value that the TT2 brings into play.
There was another response from Hilde45 that should provide considerable insight to your question. Please click on the posted link he or she provided. Really good stuff. Good luck in your purchase. Let us know what you decide. I am sure you will be happy with purchase!