I am looking for a recommendation for a can amp for my Senn HD600s, in the up to $600 range preferably, that would include a USB DAC (mostly computer source) and have pre-outs for power speakers (XLR would be mint, as I intend to use pro monitors). The only one I know is Topping DX7S, but I've read some issues with noise level. I'd love to grab a used Oppo HA1 but I'm not willing to swing that much for such an amp. I am currently using the headphone amp built into my Scarlett 6i6 multi-feature whatever you call it that I mostly picked up for measurements (I am a bit more of an objectivist than a headphile). Thanks in advance.