Hi Milpai,
I don't think you can go wrong with either of your choices. The Esoteric
(K-05X) will probably be a bit more forward sounding and detailed while the Marantz will be slightly more laid back in presentation. Not to muddy the waters but have you considered getting your Oppo 205 modded by Modwright? I only make the suggestion because I have a Marantz S8005 modded by Dan and have been very impressed with the results.
I don't think you can go wrong with either of your choices. The Esoteric
(K-05X) will probably be a bit more forward sounding and detailed while the Marantz will be slightly more laid back in presentation. Not to muddy the waters but have you considered getting your Oppo 205 modded by Modwright? I only make the suggestion because I have a Marantz S8005 modded by Dan and have been very impressed with the results.