The M-Audio Audiophile USB is OK for starting out, but sonically it is not really an "audiophile" piece.
For the next level of performance, the Apogee Mini-DAC with USB input is a big upgrade in sonic performance. It sells for around $1100. It's sonics are improved further by powering it with 12V battery power (I'm using a 7AH lead acid battery).
For the next level of performance, the Apogee Mini-DAC with USB input is a big upgrade in sonic performance. It sells for around $1100. It's sonics are improved further by powering it with 12V battery power (I'm using a 7AH lead acid battery).