djgreg, there are 2 very important factors when buying a helmet: fit/comfort, and Snell certification. I would recommend going to a place that has a really good selection of helmets, and try on different brands/models to find out what fits you the best. After you've found one that's comfortable, get online, find the style you want and order it from a reputable online store. You'll save money.
As far as price, it isn't really necessary to spend 5 or 6 hundred unless there is a helmet that you absolutely can't live without in that price range. Also, be wary of anything that is under about $200, because there are
cheap helmets. My second helmet was a Vega Nitro. Me and my buddy each got them cause there was an awesome deal online. After a few months, one of the vents that runs along the top started peeling away from the shell due to inferior adhesive. I even saw that happening on the same model of helmet at the local dealership (and it was a display model
Since then, I've owned 2 Icon helmets, a Shoei and a KBC. Aside from the Icon Domain, I've had no complaints with any of those helmets.