Chinese (Mandarin of course!) and Spanish.
As for the guy who said that the Japanese grammar is easy....
How many lessons did you have? Japanese grammar is one of the most difficult in the world, and i am German. Sure the first few weeks are easy because there is no plural, articles, gender or cases.
But then the Japanese language has honorific language, a total different passive and so on and so on....
There aren't also 3 alphabets, clearly speaking there are 3 alphabets (Hiragana, Katakana and Latin) and the Kanji of which you would need about 3000 to be considered of education, 2000 are what Japs learn in School.
If you want to learn a language for the goal and not for the fun of it, go for Chinese or Spanish.