Join Date: Aug 2003
Bikes: '03 Fuji Roubaix Pro; '03 KleinGi Attitude; '06 Soma Rush; '04 Surly Cross-Check; '06 Soma Rush; '07 Scott CR1 / Chorus
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If it's a used helmet, I'd throw it out and buy a new helmet. Most bike helmets are designed to be single impact only.
Not sure what country you're in, but in most countries all bicycle helmets meet the same safety standards. While I haven't seen much published about which helmets exceed the requirements, and which helmets merely meet them, in general the cheapest helmet will protect your head as well as the most expensive one. In more expensive helmets you typically get more ventilation, less weight, and sometimes a better harness system.
The most important thing about a helmet is that it fits you properly. Go to a bike shop or a large sports store and have a look at the helmets they sell - any of them will protect you well if they fit, and $25 should get you a comfortable helmet (Bell and Giro seem to be the two most common helmet brands available in the USA).