Current recommend for a helmet?

Good afternoon all,

was just cleaning up when I picked up my bike helmet and one of the plastic bits just cracked in my hand. Guess it's time for a new one; especially when I look at it and see a 2008 manufacture date (do as I say not as I do.) Pretty sure it's a Trek "Vapor".

What to buy? It's not like I can just run down to my LBS and start trying them on, although if I knew what I wanted, I'm sure I could get it from them to toss them a little bit of business, but it's all curbside pickup and by appointment now.

Would like something well ventilated as I'm a damnyankee living south of the Mason-Dixon, so most of the year it's warmer already than I'd prefer. Affordable is a plus.

thanks for any advice.