Full Face or Open Face helmet for track events?

[BlackBMWs]

I suspect there will be different responses for personal preferences here, but I am in the market for a helmet for intermediate track events. I envision to do a few events a year and am debating getting a Full Face vs Open Face SA2010 helmet.

• I will always be in a cockpit (As opposed to open wheel track cars). Track, Auto-x is where it will get the probable use.
  
• Figure 90 degree plus weather on a normal basis.
  
• I will be wearing prescription driving glasses
  
• I drive black TI's. Is there an optimal color for any safety or advantage reasons? (I saw Steven's thread about contrasting color gloves) Does helmet color matter?
  
• Does helmet venting matter in a cockpit?
  
• How should the helmet fit? Snug, secure but comfortable I envisioned.
  
• Does the type of chin strap matter for comfort/effectiveness?
  
• Thinking $200 budget for a new helmet. If I progress where I need a better one in the future, I'll address that then.

Thanks for any feedback here. Cheers!