[Spridgets] Good Helmet for Track Days?

[derf]

What's a good entry level cranium protector for tooling around a road course?

I ran into an old buddy with a new Mustang and it looks like I'll be
heading to the track soon.

As it turns out the LA State Police has a 2 mile road course that they
use for training.  They rent the facility out of track days, drifting,
etc.  Who woulda thunk it?  I just keep hearing Junior Brown singing
"If you wanna race then get on a race track".