Ladies opinion

My boyfriend and I were talking about our future together and we both want to get married(not any time soon). So he asked me what kind of ring I want and He asked me to go to the store and show him what I like. But I don’t know if I want to do that. I don’t want to know what Ring I’m going to get, I always thought that it has to be a surprise! I want to be surprised when he proposes to me and also with the ring. But at the same time I want the ring to be something I like. So I don’t know, I do have some ideas in mind and I even have pictures, but he still wants me to go to the store with him. What do you ladies think?