Alpha over...kill?
QDM,
I'm thinking the Alpha may be a bit overkill (which is ironic in itself, but I couldn't think of a better word) if you're only going to be using them in a Cub. As a mate of mine says, a Cub carries just enough energy to barely kill you.
Obviously headroom in the Cub usually isn't a problem, but I seem to remember the Alpha being extremely expensive for what it was. I and most of the aerobatic pilots I know that wear helmets use the HGU-55. Get it from the States at current exchange rates and you can do very well. They're a good helmet (good enough for NATO fighter jocks is good enough for me) and they're lightweight. Given your application and how much you're going to be wearing it, I think the light weight, slimmer profile, and reduced cost of the HGU-55 would make it a better choice.
But that's just my .02 worth.
Pitts2112