Well nitro buggy I bought a Jammin X1 that I have yet to run due to the weather
its $340 at amain RTR
I got the CNC F/R brace and the CNC Z-brace which is all I heard it needed to make it insanely durable. I spent about $40 on them(gotta love ebay) where their retail price is almost $90ish total. I've yet to break in the buggies engine, and have already reinforced the frame . The guy who told me about the braces him and his friends own Jammins, and said with those braces you would have to go out of your way to break it (and they've tried).

and most my others I usually try and get aluminum steering knuckles cause I have had bad luck with breaking them in the past. I also like to get alum shock towers (had the alum shock tower for my DF-02 before I even got the kit).