Make sure you get one that fits you properly. Go try them on in person before you buy. It should be very snug but not uncomfortably so. I wear a medium Shoei.
Generally, what you get with the more expensive helmets is better ventilation, better shields, and less weight. I've been wearing a Shoei RF1100 for almost 3 years now and have well over 12,000 miles with this helmet. I love it and would only consider replacing it with the X-twelve from Shoei.
BTW-I've never had a latch system wear out but I tend to replace helmets every few years or 15,000-20,000 miles. Still, I'm always removing the shield to clean it or replace the tinted shield with a clear for night riding. I'm a big fan of the Shoei Spectra shields (mirrored). They reduce glare and fatigue on your eyes when riding on a sunny day but still give you a nice bright view of the road. For night time riding you should never use a tinted or mirrored shield.