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If you get yourself to somewhere that knows what they're doing then either Shoei or Arai can be made to fit. Both are now available with varying thickness cheekpads and in some models the crown/skull cap can be swapped out to tailor the fit. The days of having a "Shoei head" or an "Arai head" are long gone. I've had Arai RX-7GP's (medium) and currently have a Shoei X-Spirit II (medium with thinner cheekpads) and can't fault the fit of either.
Not sure what the score is in the states but in the UK at least Hein Gericke (now defunct?) used to be preferred dealers for both so would allow the pads to be changed at time of purchase free of charge. Smaller places you may have to pay for the different pads up front.
Yeah - there's nowhere that isn't a schlep in LA to try one. Frankly, I've always loved the fit of Shoei, I was only considering Arai again as they've re-issued Kevin Schwantz's Pepsi Suzuki colours. My first ever helmet, bought secondhand for 40 quid and then gratuitously resprayed orange and silver by me because it was so chipped up. Foolish boy.