If your trip is round trip, depending on the class of ticket you would get, and if you don't already have Gold status within Star Alliance, I'd say go with Aegean. One round trip ticket would bring you very close to Gold status. Upon registration, Aegean gives you 1,000 miles, then if you get 100% mileage from your trip you'd be already over 17K and one needs only 20K to reach Gold.
See which class would give you how many miles:
http://en.aegeanair.com/milesandbonu...les/#LUFTHANSA