If your main replay is Redbook CD then definitely my pick is for the MSB as it has a true discrete Ladder Multibit dac for that.
"There are three DACs on this chart, the Platinum Signature Ladder DAC, The Burr-Brown PCM 1738 (a high performance delta-sigma DAC), and another ladder DAC by Burr-Brown, the PCM 1704. The Delta-Sigma DACs do spec very well but they do not tend to sound as good as the Ladder DACs."
It can also do DSD if you want.
"The DAC IV plus is able to accept DSD in all of its digital inputs, not just the USB input like most DACs. You can play .DXD, .DFF and .DFS files and can play 64x DSD and 128x DSD. Please note, you must have a 192 kHz USB input rate for 64x DSD and a 384 kHz USB input rate for 128x DSD."
And I would spring for the "Optional Attenuator" that way you can go direct into your poweramp/s.
"To achieve the simplest, shortest possible signal path with the least possible degradation of the true music. The Signature Volume is controlled in 1 dB steps from +9 to -69 dB. Half or quarter db steps can be selected as a menu option. The Volume Control is completely bypassed when at 0 dB."