Good points, Tobias. One other might be that you will be taking up one USB port with your DAC and if you only have two on a Mini and need one for keyboard and the other for a DAC...may be time for a hub. Anyway, I'm a Mac guy and have had two iBooks. Never had an issue with any USB externals. YMMV.
Regarding using the Toslink on a MacMini or Tower - wouldn't be my choice. I'd do that conversion (to SPDIF) via USB inside the DAC rather than inside the computer. Again, Too much going on in the lively electronic environment inside a computer. Take it out of the box and give it to the folks who are all about audio - that's what I'd do. Just one opinion though.
Marco
Regarding using the Toslink on a MacMini or Tower - wouldn't be my choice. I'd do that conversion (to SPDIF) via USB inside the DAC rather than inside the computer. Again, Too much going on in the lively electronic environment inside a computer. Take it out of the box and give it to the folks who are all about audio - that's what I'd do. Just one opinion though.
Marco