For that desk setup I'd get a pair of Genelec 8010 (tiny monitors) that would sit on your desk, a Genelec 7040 sub to sit under the desk, and an external DAC. Possibly overkill price-wise, but will be very nice and doable at less than the cost of a Samsung phone that does nothing special but fold in half until you biff it in the trash can in a few short years - you could be still happy with the Genelecs in a decade or two.