I don't know what it would cost for 2 travelers, but I went to London, Dublin, Amsterdam, Luxembourg, Belgium, and Northern France. The first 3 are best for singles, and I'd wager the last 3 would be great for a couple. Luxembourg is small, absolutely charming, and english and french are commonly spoken. I recently went on a vacation to Santiago and Chilean Patagonia and it was one of the highlights of my life. Chile is cheap, safe, comfortable, and spectacularly beautiful. If you like wine, seafood, glaciers, and want to see penguins its a good go, but I imagine the travel cost and time are prohibitive leaving from the host nation. Iceland is also an amazing destination, quite expensive in 2006 but I imagine it is substantially cheaper now.