The 518 will probably not be enough for this, won't pass 24/96 through. By the time you get to 568s etc you're talking lot of moolah and might as well go straight to Sooloos.

A lot of folks here use the M-Audio C02 or C03 as a cheap substitute.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.