Change your car only if you have grown tired of your car, you have $$$ in your pocket and ample space in your porch. If you can wait a little and not desperate to sell yours, wait some time and buy a new car rather than a used one and sell your own car after that. This way, you will be able to get the best price, and do justice with your current car in finding an owner who takes care of it.
Nothing wrong with buying a good second hand car, but you already have your own used car as a good benchmark. No one else's used car will give you the same pleasure.