It's a shame to waste miles that you have any possibility of ever using. Check what your fare class earns on various SkyTeam carriers. I'd be inclined to suggest parking the miles with DL because their miles currently don't expire. Maybe if five years, you'll have another SkyTeam flight to credit. Also, in 2015 DL is starting one way redemptions so you might get a coach ticket for as few as 12,500 miles. You could easily earn this for your flights if your fare class gives 100-150%.