Must be good always expensive???

Hey guys, I have a few questions for the specs here I have a BMW 518i (E34), which makes about 50000Km in the year. I bought it only in April, and I drove the year over on winter tires……I know, you shouldn’t ……but you didn’t go any other way. Then I bought a 2nd set of aluminium rims, which I would like to ride with summer tires. At the time 235/45R17, but just quite drove off, the pellen. Since I am myself a mechanier…… truck department…. I know that one should not save too much on the tires. BUT, trozdem I pour some oil into the fire What do I have to spend for good tires at least??? My brother drives the Barum on an E39, and is also quite satisfied with it. Only I want to know from you if I can drive easily e.g. Barum, Roadstone etc., or if it must necessarily be Conti, Michelin etc. to be safe underwgs. To use: I drive 90% Danish road, which is limited to 80Km/h, and d The last 10% share the city and the highway, and I’m more likely to drive in the city. If the highway, this one is limited to max. 130Km/h. So long speech, short meaning???? What price-worthy summer tires can I unafraidly screw on in size 235/45R17??? Hope you know some