And my experience was exactly the opposite - which shows how important it is to try on various helmets before buying them:
I also agree with Ken - TRY ON and KEEP ON for 20 mins or longer if you can!!! Its not about the money (although I've found a corralation with amount of $$ and comfort when it comes to my head - I hope you're not as "lucky" as me!)
My REAL point is if you spend and extra $500 and do 10 track days a year for 5 years the $10 extra per track day is meaningless, so don't let the upfront expense freak you out - Thats why you shouldn't wait to buy better safety gear - the faster you start amortizing it the cheaper it gets!!!