Ok. I would suggest you prioritise comfort and feel over considerations of cost or construction. Take your time to get the straps right, take a buff or cap etc to be sure that it'll still fit and be comfy with some winter ear warmth as well as on your naked summer head, If you can't go out for a test ride, keep it on in the shop for as long as possible, waft it about on your head as much as you can to get some sort of feel for the airflow across the vents.
In terms of impact testing, SNELL standards are generally considered to be higher than EU or BS.
The helmets I've owned have generally been £20-40 range, Bell, Giro and currently a
Decathlon one. I've tried far more expensive helmets from same manufacturers and supposedly better names and found them far less comfortable, Specialized ones particularly fit my head like an instrument of torture, they are unbearable after minutes.
This is a key consideration, you can own the most expensive or best constructed or highest performing in regulatory tests helmet in the world but if it hurts your head after 10 minutes will you really be wearing it for an all day ride?
You are the only person who can decide which ones make your head happy and which ones don't, after that you can make your own value judgement on cost, manufacturer, the importance you ascribe to the standards sticker it has inside, how well constructed it looks and feels and which one you will feel most confident stepping over your crossbar wearing.