I finally got a definite answer from Grizzly as to the maximum
combined workpiece/workholder weight for the G0463. Approximately 100
pounds.

Knowing that, I might have ruled out the H7506 index table at the
start (128lbs).

I have noticed the Grizzly H7527 6" Rotary Table w/ Div. Plates
http://www.grizzly.com/products/h7527

Table diameter is about 5.9", height is 3.9", weight 26 pounds.