How to set up a Mac mini for music only?

I'm new to computer audio and am thinking of using a Mac mini exclusively for music. I am mostly illiterate when it comes to computers and would really appreciate your ideas regarding the optimal configuration of such a mini. I will be running it through an as yet unknown USB/SPDIF converter (maybe Bryston?) to a first generation Berkeley Alpha DAC to my Audio Research VSi75 integrated to my Dali Euphonia MS 4 speakers.
Any suggestions regarding memory, processor speed, backing up, best auxiliary programs to use with Itunes, cabling, you name it would be greatly appreciated.
Also I understand that I can use my ipad to control the whole thing?
Help please?