I want to build a robot so that I can experiment with robotic navigation and sight.
You misunderstood me somewhat. I meant that I would not take a part an RC vehicle if I had to smash into the frame. I prefer an RC vehicle to have screws so that I can unscrew it and put in components.
The other difficulty would be rewiring the motors. I would have to unsolder the motors from the control board (a tool I don't have) and figure out where everything should connect to.
The car you mentioned seems a little too pricey for what it is, and is too fast for what I want it to do (navigation: i.e., exploring an area and being able to create a map of that area in memory to use later).
If I decided to use the car you mentioned, I would need to gear down the speed and do a significant amount of rewiring.
It seems that legged robot is best for what I want it to do. Thank you for your comment on buying robot parts, by the way. I will do some more research to see if I can find better prices.