kind of like asking "I've got a high end carbon fiber bike I'd like to carry on vacation - should I buy a Monster Truck with the extra Chrome option??
the Dark Star uses bridged output high voltage power chip amps (==op amps, and poorly speced for audio compared to LM3886)
its sole objective justification is driving insanely low sensitivity, lower impedance headphones - HiFiMan HE-6, you also could justify using it for the high V swing with AKG pro "monitor" headphones intended to connect direct across a normal audio power amp outputs
the HD-800 and the Dark Star don't belong together - the HD-800 is a High Z, moderate sensitivity headphone at 300 Ohms, can be driven to >120 dB SPL with ~12 Vpk, 40 mA - no need for 60 V, 4A
the objective, manufacturer's datasheet performance graphs for the power op amps used in the Dark Star show evidence for rising distortion at low signal levels - almost certainly crossover distortion - "lower levels" is the only place you would ever use on the Dark Star with the HD-800 - and crossover distoriton is generally considered the most audibly objectionalble