I don't know the first thing about motorcycle helmets, but here's some advice for shopping for bicycle helmets which I suspect would also apply here...
Before you order any helmet from Amazon or any other sight-unseen location, be sure to find a way to try on that model of helmet (or at least that brand of helmet) prior to your purchase. Different bike helmet manufacturers make helmets which are shaped for slightly different shapes of heads, and a brand/model which might fit some of your buddies just great might be awful for your noggin. For example, Bell makes bicycle helmets which are slightly more wide/round than other manufacturers, while Specialized makes helmets which are slightly more narrow/oblong. Several of my friends swear by their Specialized helmets, but the pressure points hit my head in all the wrong locations, so I only wear Bell. And how that helmet fits you, particularly during periods of prolonged wearing, is going to have far more impact in the long run on your satisfaction with the helmet than the price or graphics.