you get what you pay for as far as street helmets goes. it all just depends on how much you value your head. I wouldnt use anything other than arai, shoei and agv. I have put them to the test when i used to road race and they held up real well during a few high sides. ive seen other brands like kbc and hjc that did not hold up to good after a crash on both the track and streets.
well, i found some shoei ones i love but they carry a $500 dollar price tag. i looked at some others too like hjc, kbc, joe rocket, scorpion, and all them. never looked at agv or arai though. ill take a look at them.