(1) A bird in the hand is worth two in the bush. To have the job now even though it's not exactly what you want is important for the aforementioned reasons. Not to mention the possibility of transfer. I would lean this way.

(2) HOWEVER, I am the type of person who won't shine unless I'm doing what I love and am passionate about. If you are the same and think that might have a hinderance on your performance then hold off. If you have the discipline to buckle down even though you don't like your job then refer back to #1. By judging your opportunities, I would surmise you have the discipline that I lack.

Good luck.