Why do you want to upgrade? What is your experience (good and bad) with the DAC-1 you have?. To really find out what your dac can (and can"t) do, try direct imput from dac to amp with only a volume control between them. I guess my point is to make sure any upgraded dac is going to improve your system in a way you find significant (and worth the cost).
MSB III vs. Soundstream DAC-1 by Krell
Got a Soundstream DAC-1 (the one Krell helped to design). Thinking about getting a MSB Link III. Thoughts? If this is a improvement how much of one? Vs. a upgraded MSB III (half nelson, etc)? Other Good DACs vs the price of a fully loaded MSB III (Half nelson, and unsampler) $850-+ Assembalge DACs?