You wont get any better than an rpi and one of the allo devices(depends on if you own a dac as to which one) considering the outlay which isnt terribly expensive, and although stand alone this is very good, it gets better if used in conjunction with Audirvana on your pc/mac. A fastish pc is preferable here. But even using an rpi with just a tablet as a control device you will be happy. You will be able to use your own music/and or something like tidal too. volumio2 is imo the easiest and best system for rpi.