Model	Weight	Misc.
TI-36x	3.5 oz.
TI-82	8 oz.	ROM 18.0, Plastic screen cover cut out
TI-82	8 oz.	ROM 19.0 (both old style case)
TI-83	8 oz.	ROM 1.07
TI-83 Plus	9 oz.	0299 HW
TI-83 Plus SE	9 oz.	0201 HW
TI-86	8.25 oz.	0500 HW
TI-89	9 oz.	0999 HW

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Thoughts:

The calcs were surprisingly similar in weight. I expected the 2 MB flash chip in the 83+ SE to weigh more than the 512 K in the regular 83+. I also expected the 89 to weigh more with its increased RAM and flash. I believe the 86 weighed more because of its extra RAM chips as compared to the 82/83.