What is the difference in the Medallion and Diamond series beside $1000?
Good question, I'm glad you asked...
honestly I don't see anything that the higher end models offer that would really be worth the extra money, at least for me anyways.
quoted from the Cnet website...
733 series
Models
57-inch WD-57733 ($2,500)
65-inch WD-65733 ($2,999)
73-inch WD-73733 ($4,700)
Features
Three HDMI 1.3 inputs with Simplay HD certification
Three component video inputs (two rear, one front)
USB port for photo viewing
734 series
Models
57-inch WD-57734 ($2,799)
65-inch WD-65734 (no pricing)
Features
Same as the 733 series, plus:
PerfectTint, for additional customization of display settings.
NetCommand, which is designed to let the TV control a rack full of A/V gear, much like a universal remote.
An additional front HDMI input.
"Diamond" 833 series
Models
57-inch WD-57833 ($3,399)
65-inch WD-65833 ($3,999)
73-inch WD-73833 ($5,899)
Features
Same as the 734 series, plus:
FireWire port
RS-232 input
Smooth120Hz, which appears to be Mitsubishi's name for 120Hz refresh rate. A 120Hz refresh rate supposedly creates a smoother image during fast-motion scenes, although we have yet to test it with Mitsubishi or other manufacturers.
TV Guide On Screen, a built-in electronic program guide.
Game FX, which is 3D gaming functionality, although there are no current titles that support it.