I had a Ovation Schooler for about 3 years and just brought a Tipperary Sportage. Both are under $100, light, comfy, and I forget that I am wearing them! Also both have been cool enough to ride in the Texas heat.
I do think I like the Tipperary a little better though. I chose it over others because everyone and their mammas rave about how great they are... I must agree with them! Looks nice (doesn't make my small head look goofy like other helmets might), is very breathable with all the vents, and is very comfy. I also like the outer material- seems to keep neat and clean. The Ovation would scratch up very easily and this bothered my slight ocd a little bit.
That said, I have to agree with posters above. The "best" helmet is the one that fits your head, is comfortable for you, and does it's job: protecting your skull!
My best may be different from your best because of head shape and comfort level.