mb42x is a great choice. the schiit and fiio are headphone amps and would not power speakers. I would get a cheaper amp like this and a 3.5 to rca cable. find a warehouse deals mb42x on amazon, and you have a sweet system for near $100. The next thing I would get is any semi-decent subwoofer (like dayton sub-1000 or 1200) to fill out the lower end.