I fianlly ended up with a Bern Brentwood. I really liked the idea of the Allston but I found it didn't fit my head. I thought I had discovered that Bern changed their sizing between 2013 and 2014, but I think it is just the liners that changed. And that was so they could have less combinations. The 2014 liners get tighter so they can market a XXL/XXXL instead of XXL and XXXL separately.
The Allston I think fits a rounder head perhaps than mine. The Brentwood (XXL/XXXL) fits perfectly. As far as ventilation, the Brentwood is very well ventilated when moving. I do notice some heat build up when I stop. No idea how this would compare to an Allston. It doesn't feel much hotter than my old traditional helmet, is way more comfortable, and now I am set for the colder days to come. I always liked the look of the Brentwood better anyway, and it will look more at home on the ski hill than an Allston.
I got a great deal at REI for the winter version. I wasn't expecting it to come with a summer and winter liner, so the sale was an especially good deal.