No contest if the sound quality is your primary criteria, ericruff. Since MW uses the same base power supply type, similar tube circuitry, and vibration-reduction modifications an all of their players, any properly-functioning MW player will soundly trounce any under $5k OEM stock digital player out there musically, and hold its own with most any of them regardless of price.
The Marantz has more flexibility (important if you need a good DAC for playing Hi-Rez or other downloaded media) and is new, thus should be less prone to need repair (Sony’s have occasional issues with the optical drive which can be bought new for $50). If those criteria are your priority, then go with the Marantz for now and have it ModWrighted when funds are available.
If you are all about musical reproduction quality, have a large SACD or CD collection, are not completely risk-adverse, and plan to use your player solely for playing discs, the MW 999ES is clearly the better choice IMO.
Best to you ericruff,
Dave