From personal experience I would stay far away from the Marantz (very over-rated mass market junk...don't believe the Stereophile reviews). I have the Jolida JD 100 which is a solid value for approx. $600 used... you can use the left-over money for some RCA NOS tubes and a Flavor 4 power cord or some better interconnects. If you want to spend a little more, the Arcam CD23T or CD33 are solid choices.
Another option is to use your Kenwood CDP as a transport and get a Bel Canto Dac1 and digital cable.
