I would definitely try one on first. they all fit a little different, and the most expensive might not be the best fit. The Bell 500 fit my head the best.
I have a Davida Speedster that is really nice but it has a slight pressure in the middle of my fore head? Has any one ever tried shaving some of the foam liner to perfect the fit?
My Davida did the same thing. I didnt shape it at all, once you break it in (i.e. suffer through the pinch) it will fit like a glove. At least mine does now.
Am I the only guy here not to have got on with Davida? I bought a Davida Jet and it looked the business. I bought the large size, that I could get on my head ok. It was a little tight, but I expected that. My problem was that I couldn't wear it with sunglasses, every time I turned my head the glasses more or less stayed in place and I ended up bruising the bridge of my nose! I figured that the helmet needed breaking in, I couldn't wear it on the bike, it was too uncomfortable so took to wearing it around the house, much to my wife's amusement, but I never did break it in and ended up selling it. Perhaps I needed a bigger size?