The vents are usually found on GPA's and CO's, along with the IRH ATH (I think that's it?) Those are usually seen in hunter/huntseat shows. If you're just doing hunter riding, like lessons, or schooling shows, you could use GPA's, CO's, Troxel (I have a Grand Prix Gold that I LOVEEEE!) and then IRH has some-- must be SEI/ATSM certified.
As for an everyday one, I ride in my IRH helmet that is a little dated and can't be used in IHSA shows. Also, my trainer makes us wear an ATSM/SEI certified helmet for lessons if we're jumping.