What is wrong with your current DAC? There isn't any magic to them. They all use a common system for doing the digital conversion. I have owned everything from the DAC in a Sony Walkman to a high end DAC costing nearly $2000. Through headphones, there was no meaningful difference. I didn't own the expensive one for very long. I had an outboard DAC for my recording equipment but only because it was an ADC as well. Your money is probably best spent elsewhere in my view.