For spring/summer there is nothing like a crisp white purse. It can be used all summer with every color in the wardrobe. As for hardware, you may not have a choice; my white med classic has silver and it's fine.
Beige is also a nice neutral. I finally added that color to the collection last year as well but white first, imo.
Are you getting it in caviar or lambskin? I prefer the white caviar flap over every other color and think it looks best with silver hw. However, I would never recommend a white lambskin flap because I'd be so worried about getting it dirty. In that case I would recommend a beige flap with gold hw. Good luck!