Considering you said you planned on some SCCA competition, you have another reason for putting out the extra $ for a more expensive Brain Bucket. A lighter helmet, although it costs more, is far less fatiguing after 20 laps on a circuit, and even if only Auto-Xing, you'll feel a difference in maintaining focus and retaining that Safety margin.
I'm also currently shopping similarly, and will probably want something that is appropriate for other motorsports, and my process involves picking out a model and manufacturer and retailer, then price last.
Spend the Time looking and the $ on a SA 2010, good for 10 years, is the plan here.
MHO-FWIW
Bob W