either prague (though I dunno about 2 weeks there), spain/portugal, or italy.
something like...fly into barcelona, work over to madrid (include a daytrip in segovia), work over to lisbon (with daytrips to sintra and maybe cascais) and fly home...maybe add another town in portugal.
Or, do a few cities of choice in italy (florence/rome/whatever) with the intention to end up in milan. When you get to Milan, hop the train up to the beautiful lake como where you can stay a night or two at the menaggio youth hostel (this is pretty sweet considering how expensive staying on the lake is in the ritzy hotels). After you have wound down a bit in one of the prettiest places in the world, you can head back to milan, see the last supper, explore italy's commercial city, and fly home.