Which summer tires to buy?

Hi guys, with my season car I will now upgrade to 18″ aluminium wheels and still need summer tires. I have seen/read the new test reports, but am still unsure. Around 225/40R18 should be mounted. Vehicle is a 3 Series BMW (E36) limousine. Ride in the season (04-09) max. 6tkm, only in nice weather, cruise more than I race. On the highway, however, more times are blown free. I calculated a lot and the Hankook S1 Evo2 would cost me about 420€, since against the better rated Barum Bavuris 2 ca. 348€. The absolute test winner Conti Sport Contact 5 ca. 490€. The Dunlop Sport Maxx RT, Goodyear Eagle F1 Asymmetric 2, Michelin Pilot 3, Bridgestone Potenza S001 lies between 440-480€. So price difference between the best is just between 70-140€. How was the Nexen N8000 tested? There would cost four tyres just about 280€. Which tire would you recommend to me with my vehicle, mileage in the year and driving style? Thanks and Greetings Patrick