One suggestion before you move on from the DAC1: You mention a lack of resolution, which is surprising since resolution is one of the strong points of the DAC. Could there be an issue with the unit you have; and are you using a top notch digital cable and a very good transport or computer source -both of which dramatically affect the sound of the DAC1?
Re the Benchmark DAC2, it does sound very different - and much improved - from the DAC1, with improved resolution and clarity, more articulate and better defined bass and midrange, and a warmer smoother overall sound.
Re the Benchmark DAC2, it does sound very different - and much improved - from the DAC1, with improved resolution and clarity, more articulate and better defined bass and midrange, and a warmer smoother overall sound.