keep riding. take up club (on track) road racing. you will soon develop opinions of what a 'good' helmet is.
DOT? is simply a fee paid to the US DOT for certification.
Snell - at least they do SOME testing.
Actually SEEING get-offs at the track, and how the helmets hold up? will help you form a real opinion.
is a $700 helmet better than a $250 helmet? no, but it is more comfortable on the inside
at the moment? I'm a big fan of the Scorpion EXO 1100 series for street. Shoei X12 for track, and I am eagerly waiting for GIVI to pay off the DOT, so they can sell their "Tourer" to me for dual sport rides....
That Bullitt is cute, it looks like the old Bell Star 2 Evel Knievel used to wear. I've never seen one at the track.