very nice comparison you've set up.
I hate to seem like I'm nitpicking, but I did notice that the width in mm for the HXT900 (cell G13) is wrong... it should be 10.668mm (at least thats what AskJeeves told me when i put "convert 0.42 inches to millimeters"
I didn't check the others, but I just thought i'd point it out in case it was a formula error rather than a typo. Can't really comment on most of the servos - only one I see on there that I have is the GWS-Naro Standard, and it's fairly new, so I can't really comment on its long term performance... Right now I'd put its value at an 8, due to the cost and the fact that it seems to be fairly sturdy. As long as it handles the wear and tear of age/use, I'd bump that up to a 9. So for now:
Naro Standard GWS 8/8