i have a POC SKull Light helmet...its a bit on the expensive side, but if your dad is willing to buy you best helmets, these are some of the best. they are double shelled and feel seriously sturdy..they also don't look bad and have a low profile. they are warm and the padding inside is removable, washable and extremely comfortable.
but like everyone else said, helmets are like boots, try them on. buy a good brand name (listed in this thread) helmet and you'll be well protected.