Having been driving the 210 for a while now i can tell you it is very strong considering its mainly plastic.
Only thing i have broken is a front hub, and that was after landing on a wall lining a table top jump.
in all honesty, the car does not NEED any upgrades. Its fantastic out of the box, as is Durangos selection of kit springs.
If you want to upgrade items i would suggest:
- Changing the plastic shims/spacers for the gold ones as the plastic ones seem pretty soft and once you tighten up a ball stud, a 2mm spacer is no longer 2mm but less.
- Shock stand offs - change these for the 410 rear ones. Again i dont think its needed, kit style is fine, but the 410 ones allow for an easier and quicker adjustment should you wish to move them.
- Rear camber plate. This is something i havent done myself, but it allows you to run a much shorter link at the rear which seems to help handling on a high grip track. Personally i find the rear end fine as kit.
- Weight wise i dont personally beleive the car needs any. but then this is going to be a personal thing according to your driving style. I am running about 60g behind the servo purely as i run saddles which are lighter than a stick pack, and also run a low profile servo.
Tyres depends on track surface and weather conditions. staggers are the general front choice, cut stagger will give you a bit more steering, but have a high side wall which can generate some grip role.