I agree with many of the posts on this thread that different DAC's will sound different to some people and the best policy is to choose the one in your price range that sounds best to you providing you have an opportunity to compare different DAC's in the same setting. If you don't have an opportunity to audition the DAC's select a few with features you like in your price range and read a few different professional reviews on each DAC to see if that helps with your selection.
I have an onboard DAC in my Preamplifier and an onboard DAC in a CD Transport and I can stream music from a separate Streamer through both devices and can say they both sound good but they definitely sound different. To my ears I prefer the matchup of the Streamer with the DAC in the Preamp.
For CD's I prefer the sound of the DAC in the CD Transport possibly because it was designed to work as a system.
We all hear things differently.