Benchmark DAC1 vs CAL Sigma


I have an old CAL Sigma I in my system. I generally like the sound, it's musical & dynamic, however there's a bit of shrillness in the top end that I find off putting. I'm wondering how different a modern upsampling DAC such as the Benchmark DAC1 or a PS Audio Digital Link III would sound in my system? I'm a bit of a noob with external DACs so any input would be greatly appreciated.
craig_hoch
transnova - both outputs are active. you can switch your preamp inputs to see which sounds better. i like the tube sound with the better tube installed. probably will be replacing the opamps in the near future.

also, i also use jitter devices before my dacs. i currently use the monarchy dip units. i have used the audio alchemy dti in my den and family room with good results.
Thanks Rbstehno!!! I've been playing around with a Citypulse DAC.I like it a lot but am curious about the tubed section of the Music Hall.Also interested in the balanced outputs.