I think Platinum Egoiste would be an excellent choice actually. I wore this as my SOTD recently after not having worn it for a couple of weeks and I had forgotten what an excellent scent it is. It is fresh, gentlemanly and has good longevity too. If I were you I'd buy yourself some little 2.5ml atomisers off ebay, decant some and keep it in your pocket to refresh during the day.
I would also recommend a bunch of Penhaligons, Endymion, Castile or Blenheim Bouquet, which are all light and elegant fragrances.
I would also consider Eau de Cartier too which is fabulously light and elegant too.
I'd avoid anything too heavy - so you could also consider Guerlain Vetiver too.
Any Acqua di Parma Colonnia, Asoluta or Intensa would also be an excellent choice.