Personally, I'd say go for a DOT-approved helmet. The problem most people seem to have with DOT helmets is the size and bulk. If I looked at the right page, the Biltwell novelty helmets seem to have all the size and bulk without any of the protection. Bell, Z1R, Rockhard, THH, Vega, and a ton of others make DOT helmets that look almost exactly like the Biltwell novelty. Aside from the finish, the DOT Biltwell looks pretty much the same too, for that matter.
*edit - Just checked out your build thread. That orange looks awesome! Are you trying to find a helmet to match the color?