Choosing between helmets

Hey all, I'm helmet shoppin atm and basically thinking about two in particular. Nolans N84 and Sharks S500 Air. Anybody able to compare the pair? Nolan has the communication stuff which doesn't interest me and the fancy-smancy weather protection stuff which I'm not sure is really needed. It also has an extra $100 on its price tag.
Most importantly I'm just wanting to stay cool in summer and keep the rain from coming in.
Most importantly I'm just wanting to stay cool in summer and keep the rain from coming in.