Naive Question: buy a Delta now?

Dear fellow forists, I have lost my soul in Delta III and would like to buy a used one. I have a few questions for this: 1. quite naive: I am not a car expert and I have to drive to the workshop for almost everything. How do you value the situation? Can I rely on it through the Fiat Bravo base at least to continue to get everything but body parts without any problems? 2. Children’s diseases should not exist according to the forum, which one should pay particular attention to. Are there any tips for the motorization/the year of construction/etc.? 3. can one retrofit Magic Parking? I am restricted in health and that would be very much in line with me. Unfortunately, on mobile etc no Magic Parking in my zip code area. What would cost such a thing? Unfortunately, there is currently hardly any blue Delta in my area – I find the color super chic! 4. Where do the price differences come from? If I look at the offers for equally equipped vehicles with similar running performance, sometimes extremely different prices are called up? Thank you very much!