I’d check with your local tracks to see if they’re running the Kyosho Inferno GT RTR cars. They're also in the $400 dollar price range.
There are a lot of “Spec” classes popping up at many tracks using these cars.
For $500 dollar range, the top 5 will buy you a chassis kit, and then you’ll need to buy a motor and everything else.
You could also look into the Team Magic G4s RTR. I think it’s in that price range too. The TM car just won a big race in Europe a week or 2 ago.
Good luck, hope you get what is right for you!