Do you also have something under $5000 that will kill anything on the market for under $50000?
Nothing turn key sitting here on my desk ATM. But wouldn't be difficult if you were okay with an open PCB sitting on your audio rack. Most of these guys put more money into the cases than what's inside. Either that or you're paying for the ip that went into them.
Handing the SDM/SRC on the computer end can chop about 50% of what you're paying for with one of those DAC's in that league.