Mexico or Germany?

Next summer I need to go somewhere. I'm starting to get the itch to travel again...No, I take that back. It's starting to overwhelm me. I've been dying to get back out into the wide world beyond Kentucky since Last year, and my brief two weeks in Germany last spring only made me want to head back out even more.
Will I ever want to settle down?
I'm 20, and while I'm young, I want to go places and see things. I want to learn other languages and understand other people. I've started unofficially learning some Russian from a friend of mine, and I've got this little bit of French I picked up during high school...I could get my fluency in five languages within the next two or three years if I try hard enough. But I'm not quite ready to start working on the new ones yet. I want to go back to Mexico or Germany. The question is, which one do I pick?
Mexico is cheaper (but only by about $200). I've not been there since the very end of 2004, and I can't believe that. There's also a good deal of help I could contribute there...
Germany is where I feel a bit more involved. Having lived there for a year, keeping in constant contac with friends from there, and the good public transportation is a plus. Europe is really fascinating, but also a good place to relax.
I really hate having to decide. Part of me wants to go to Germany for a while, then head to Mexico immediately afterward. Part of me wants to spend the whole summer abroad. Part of me wants to slap both of those other parts in the face.
Anyway, any input? Flying to Mexico will cost roughly $530...Germany will cost anywhere from $800-$1000...but if I start saving now, it shouldn't be a problem...There are also other things I'm considering...Grad school, immediately employment...It's all too much. I have no idea what I want to do right now.