Street-prepared? Looks more like STS to me (much easier class as well).

For $400 I would recommend getting some brembo blanks and a decent set of pads. You really can't go wrong with fade-free stopping power. With whatever money you have leftover get a tire-pressure gauge. The #1 recommendation that I received from the more experienced guys was to pay attention to my tire pressure. THere's always someone at the event who will be willing to let you use his air pump and whatnot.

Shingo