The whole €80 versus €400 thing isn't really a straightforward choice like it sounds. It depends a lot on how much time you're planning to spend in the mountains and especially on how easily you sweat. If you're getting back into skiing after years, you're probably going to be pretty exhausted, and a jacket that doesn't breathe properly will have you literally soaked in sweat within an hour. Then when you stop moving, the cold hits twice as hard, it's annoying and you risk actually catching a chill. The real difference between a decent base jacket (€100-150) and a proper technical jacket (€250+) is mainly in breathability, sealed seams and how the fabric holds up over time.
What nobody says though: before you buy a new jacket, try asking around if anyone you know has old gear they can lend you or sell cheap. Seriously, if you find a jacket that's two or three seasons old for €40-50 among friends, it's often better than a new rubbish one. In the meantime you'll see how you get on with skiing and figure out if you actually like it, then next year you can invest without any regrets.
In the meantime, don't go below €100, make sure it's waterproof (it'll say so on the product, not hard to find) and that it breathes at least a bit. If the jacket has sealed seams, even better. Hit up physical sports shops if you can, try it on over a thermal base layer - it should feel comfortable even with layers on, and it shouldn't feel like rigid plastic.