Definitely don't get an Air Attack. Between the Evade, Ballista and Kask Protone if you want something that's actually aero. Also consider the C-Originals G14 if you want something full on bongo.
Also consider the C-Originals G14
Not seen that one. £90 and 0.5W off a bambino at 30mph? And the option to make it look less douche too...
http://shop.kinetic-two.co.uk/-60-off---c-originals-g14-2015--the-most-versatile-aero-time-trial-road-triathlon-helmet-ever-made-407-p.asp
@Yukirin started
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Definitely don't get an Air Attack. Between the Evade, Ballista and Kask Protone if you want something that's actually aero. Also consider the C-Originals G14 if you want something full on bongo.