TAnita plastic is not as nice as X-ray, but a little lighter. If you have a recent TRF car, just stock up on C-hubs, the rest of the suspension is fairly robust and I've taken some hard hits. I've ran thru some races since last summer on my 418 and only broke two C-hubs, and bent one turnbuckle.
I've broken 1 chub and an arm plus bent a turnbuckle in about a year. At the same time. And it was a BIG hit into a wall.
On the lightness bit - yup. We weighed my 419 and my mates T4/15 (with ARS) a week or so ago and he was 100g plus heavier. Might have even been 150. His batteries were 6500's vs my 6000's and I've got lightweight scress but that's about 40g worth I think.