[ratty]

i have done a beginners course in german which was fairly simple - my teacher said the first two years are very easy and then grammar gets extremely complicated after that point.

i have studied japanese for over two years and it is getting easier and easier. the more you learn the more unbelievable logical sense it starts to make. if you can master german you will be able to handle japanese in terms of grammar (japanese grammar is very straightforward. lots of simple rules to follow.)
but it depends if you have the ability to learn the characters (involving two syllabries *hiragana* and *katakana* each consisting of nearly 50 symbols, then you must go down the road of kanji (hundreds of basic kanji to learn to be able to read newspapers)

if you're not daunted by that then go for it. it is so much fun and such an interesting language to learn.

i found german and japanese compliment each other fairly well so why not start one and just dabble in the other along side for a while to see how you feel?