It really hard to say what the "right" helmet is for someone. It all depends on a number of things like: 1) make sure its DOT or the UK equivalent; ensure it fit securely but comfortably on your noggin; 3) determine what type of helmet you want (half lid, full face, modular, etc.). Beyond that its the rider's choice. I actually have a combination of helmets, modular, 3/4 and half helmets. Typically ride with my modular so I can flip it up when sightseeing, and have full face protection on the road at speed. Typically, I only wear the half helmet when I'm stop and go at a bike rally type event and doing more walking the bike than actually riding.
Ultimately, its your choice, but you can check out some of the helmet reviews on sites that DO NOT sale helmets. I have found those to be the most unbiased reviews.