New car Mercedes

Hi alle zusammen I’m currently driving a Mazda 6 Sport kombi bj 05 Benziner/lpg with 166ps which has reached almost its 200000km and is thinking of buying a new car, but doesn’t know what to look for and so you can help me a little bit. I’m thinking of getting a c or vlt even an E class but unfortunately there are many models. In the C class I find the newer model where the screen is built into the console more appealing than the old Mo dell. I don’t want to do without comfort and equipment and what should be a standing heater. Since I drive only 20km to work I have thought of buying a petrol truck again, but would rather have a diesel for the purpose of standing heating and consumption as I drive even further distances. I am curious about your answers and would like to give more information.