DAC or no DAC? If yes, which one?

I am trying to complete a modest yet quality stereo system with a Mac mini as the source component. I would like as much as possible to have no obvious weak links in the chain. The area I have come into the most confusion is how to feed the signal from my mini to the amp. Either I run an analog signal straight through the mini out to RCA or I do a mini to toslink into a DAC and feed that into the amp. The system is thus far, Nuforce Icon amp (Not the icon integrated but just the amp with a volume knob) Anti cables feeding into Mordaunt Short 902 Avant i's which are setting atop Atacama Nexus 7 stands. The two DACs I have considered most are the Music fidelity V-DAC or the Beresford tc 7520. Any thoughts? I have heard there may be compatibility issues with the V-DAC re: volume coming out maxed at all times, however it seems that with the volume control on the amp this may not be of real concern. The Beresford has an option to control the volume via the DAC but it recommends using the fixed volume output through the type of setup I describe which makes me wonder if there is any difference (regarding functionality, not sound quality) between the two considering my intended set up.