Fit is one of the most important aspects of buying a helmet. While I used to insist on Snell certification for any helmet I bought I have come to accept that the european standard is just as good and might even be better. The bonus is that they also certify non-FF helmets, something the Snell tends to reject.
I disagree about the cost vs performance thing. 90% of the cheap helmets out there will protect your head just as well as the most expensive...as long as it FITS.
The Bilt line doesn't fit me at all or I'd probably have one of theirs by now. I have an HJC and a Shoei. I do not feel less protected with the HJC.
Your biggest choice is 3/4, modular or FF. 3/4 is typically lighter than the FF, and the modular is usually heaviest.
Brands? Not really important. Fit is more important. The more expensive you get typically they are less noisy (but not always).
So go to the local bike shops and try on as many as you can. Make sure the store allows returns. You'll weed out some as soon as you put them on. The second round are the ones you can stand to have on your head for more than a few minutes. You can do that in the shop (the good shops will encourage this). Then pick one and buy it. Wear it for at least an hour at a time. If it hurts, take it back and try another. Like winger said, if you can't wear it most of a day then it isn't right for you.