SK, apart from looking on this forum, you might try searching some of the hifi press, too. John Atkinson of Stereophile uses Mark Levinson transport and DAC as part of his reference and wrote that the Squeezebox into the ML DAC is as good as the ML transport in every day use and only determined listening would highlight any preference in the transports favour. The SB gets high praise here and elsewhere.
The only reservation I've seen is the amount of time it takes to rip CDs and concerns about back up. For the first issue, I'm wondering if a device like the Olive Symphony would cut time as it has a copy of the Graceland database on board.
Regards,
Steve