Recommendations for the Sennheiser HD6XX dac/amp or dac + amp setup under $500? No tubes pls (will consider hybrids). Currently using a Geek Out 720 dac/amp (for close to 5 yrs now), and a Lavricable 5' solid silver core headphone cable. How about the Chord Mojo? I don't really care for the typical British warmth-sonics (owned a nano iDSD before). The only British brands I tried and liked are B&W and Proac.