Cue 36 page thread on helmets, "which fitting mechanism is best? and what about strap materials? and are more vents better? oval vents or thinner vents? and what about bug vent shields?"
In all seriousness. I use a Giro Indicator. As much as I would like to spend a lot on a helmet, the way I see it is if it fits and you like it, cheaper is better. If you end up using it (i.e. falling), you'll have to buy another one. They're a one-use thing. Someday I will buy a nice LAS Squalo or Lazer or something, but until then, 30-40 dollars is not bad for a solid helmet with a good fit system that doesn't look half bad either.