Well, gazoo, how often will you get the chance at a Barenia trim? There are plenty of box 28s to go around, unless you're thinking of a specific (read: rare) color. At Hermes NY yesterday I asked my SA if there was any truth in the rumor that box may be "slowing down" production-wise / discontinued / phased out. And the answer was an emphatic "NO".
I think you can probably go for your chances at both! [edit] I have to add, though, that you should really love it, whichever you go for. Don't make an impulse buy just because it's there.