Mossimo Dutti, This company creats a very elegant and sexy style for men. check out their website online. also Lacoste and Raulph Lauren are also great. By this I don't mean that you have to buy their products to look stylish, just see their style and get ideas, you can find the same products with other brands too. from middle class brands I can suggest ZARA.
ummmm I cringed when you said aeropostale, no offense, its just you don't want to be a walking advertisement. and all of their clothes have it plastered on the front (I really don't like that but if you do, go ahead) What you really need to do is go into some stores recommended by people and see what you like. Pick something up you like and ask a salesperson about it or someone. No one can really tell you what to wear or you will be uncomfortable. But ya one tip no aeropostale.