By low profile , I am guessing you mean a 1/2 helmet, "shorty" , or "salad bowl" helmet, as opposed to a full , or 3/4 / open face helmet.
Although I would rather look like a vegetable than end up as one,
if i were to choose one of the skimpy helmets I would go for the police style ones with the leather ear-flaps and visor, like this:
They make many in this style:
Do avoid the ones that have less than 1" of lining material. Saw a guy the other day riding with one that looked as though he removed the lining completely and was just wearing a black plastic skull cap.
I do strongly reccomend one of the "open face" types if you just can't handle wearing a full face one. The added protection to the back of the head, ear areas and sides of the jaw is at least a big step up from a shorty, they tend to be quieter, and allow the use of some kind of face shield:
Do make sure it is from a reputable maker..(avoid chinese helmets) , and that it does in fact have a real DOT sticker.
( and those ones BlackO linked to are the ones that do make you look like a mushroom...or , as I thnk, a penis...LOL )