You know what kinds of motorcycles never go out of style? Those simple, retro, low-powered post-war bikes. Utilitarian, city-friendly (it's all relative) and efficient. The epitome of this category are old Triumphs (left), but the spirit lives on in the Royal Enfield Bullet [$6,600]. The extremely modest one cylinder engine putting out 27 horsepower pretty much guarantees that this model won't be co-opted by douchebags. Considerably less sensible but equally cool are the insanely expensive helmets of Ruby [$1,450], but hey, how much is your head worth?