Travel Insurance

How can I get a travel Insurance with world coverage?
I need to pick up my visa to the Netherlands. In order to get the visa I need to show a proof that I and my wife will be medically ensured upon arrival in the Netherlands. In this respect want to get a travel health Insurance being in USA. Does anybody know where and how I can do that? Is it possible to do it online and fast?
Last time I traveled I got Insurance from http://www.simplyinsurancequotes.com/travel-Insurance-quote.php?id=nth
Travel Insurance