Lets talk laptops!What do I pick?

So I am going into highschool this september and I have great grades(95-100) so my parents are rewarding me with my first laptop. They gave me a budget of about $700( well actually my budget is $500 but I can bargin) and I don't know what to choose. I want lots of memory, great screen and must play movies, webcam, and something stylish because I don't want an ugly laptop. I like that dell laptop where you click and change the cover but is that any good hardware wise. I need some help. Please! Help me find the perfect laptop!