turanza dunlop michelin

Hi guys! This is my first topic here and I hope that it's not that idiotic :P I have Opel Astra GTC 1.4 for almost 4 years now and I've 53 000 km on it. Now I want to buy new tires but I'm not sure If I should buy the same Bridgestone Turanza tires or buy some others like the Potenza, Dunlop...