Thank you all for your input, it is much appreciated! To clarify, I already own the first three pairs of shoes in the finds (navy VCs, tan SEs and taupe gladiators), and everything else is what I am considering.
Toban, yes, I have lived in DC area for 8 years now. I am very happy I can wear sandals to work for the first time. Yes, I will defintily get something silver.
Anchie, those sandals are gorgeous! Thank you for the reminder about Peter Kaiser, I will check their shoes, too, when in Vienna.
Carla, thank you for the recommendation on those PG sandals -based on what you say, they sound perfect for my needs. I hope that I manage to find them in stores.
Kathie, that sounds like an excellent plan - I will definitely see what I find in Europe first.
Angie, those shoes are all gorgeous - but I already have lots of closed toed summer shoes (some similar to the ones you posted), and want open-toed, because for the first time in 10 years, I can wear them to work and am eager to take advantage of that. Thus I am looking for sandals and open toes booties. I will definitely shop for shoes while in Europe. And, I already own the Franco Sarto Huttons in black - my nod to the slingback trend, they are very comfy.