Given that you don't need USB and are willing to buy used I would search for an older DAC(+2010) having a robust power supply and quality analog output stage. Benchmark DAC1, PS Audio Digital Link III. Schitt Bifrost multibit, to name three, and there are others within your price range.
New and at $250 I agree the Modi is a good product at that price, has wallwhort power supply I believe.
New and at $250 I agree the Modi is a good product at that price, has wallwhort power supply I believe.