RE: What are some must have rc's.
Back to the OP's original question on must have RCs.
1/8 buggy
1/8 truggy
1/8 GT car
Take your pick when it comes to brand (notice Traxxas doesn't sell any of these!) but these three classes cover every aspect of RC accept for indoor running in which case I could add something like an AE RC18T or better yet an Xray M18T. The 1/8 buggy will work for smooth offroad surfaces and handles awesome. the 1/8 truggy will handle any surface and handle almost as awesome as the 1/8 buggy. the 1/8 GT car is great for onroad, parking lot bashing and insane triple digit speed runs. I don't think anything 1/10 scale is a must have since the vast majority of the are much more fragile than their 1/8 counterparts and are more limited to the surface they can be run on. but if I had a perfectly smooth and well groomed surface to run on I would like to have a high end 1/10 touring car like a Serpent 411 or an Xray T4 but I don't have access to a perfect surface so thats not a "must have".