Purchase advice for new cars 4 combos to choose from, need help… Which one is the better?

Hello dear ones, I need a purchase advice from you. My wife and I are looking for a family-friendly combination with plenty of space and efficient and economical working methods. Since we are not at all familiar with the topic of cars and motorizations, we need help from you. Since I have an employee advantage for many car manufacturers, it is almost worth buying a new car for me. See prices below. What is important for us: -A lot of space, large luggage compartment (for baby carriages) n, rice luggage etc.) -Spare and overtaking fleet engine navigation system and parking aid – For my wife it is very important that she is quiet on the highway without being afraid that someone will drive in from behind to overtake. Otherwise we do not need so many hp, we are not a raser. After long research and many YouTube videos I have the following cars to choose from: SEAT Leon ST Style or FR Variant Petrol engine selection from 116 to 150 hp Price: from 18700 to 21000 ——- —————————————————— Honda Civic Tourer Comfort Version Diesel engine 120 hp Price: ca. 20200 ————————————————————– Mazda 6 Combi Prime-Line Version (without Navi) 145 hp Gasoline Price ca. 18600 —————————————————————————– Renault Megane Grandtour Limited Energy Varinate (with Deluxe Package) 116 hp Gasoline Price: 15860 Here are a few more questions about the above cars: -Which motorizations would you like? So as I said, it is important for my wife to overtake the highway safely and well. – Suppose I decide for Honda and Mazda but without Navi, because u a lot cheaper, for how much and where can I retrofit a Navi for the two cars? -Are the prices OK, or should I grab the annual car? Would I really be very happy about your help. Thank you in advance. With kind regards. Wolfgang