Hi Pete, Seeing you don't need a phono section, The K-03 has a fantasic low output impedance (47ohm rca & 100ohm xlr) at 2.45v, that will drive anything perfectly without any added colourations that a preamp will introduce, you should give it a try first before spending up big on a preamp to see if you like the uncoloured sound it will give.
" Esoteric’s K-03 SACD/CD player and DAC ($13,000 USD), is one of their newest models of this type. In fact, it also contains a 32-bit internal volume attenuator that permits it to be connected directly to an amplifier."
Cheers George