I would definatly do it. I have never regretted getting Pebbles when Coco was 6mo old. They really have become the best of buddies. He was so good with her when she was small. I got my Trix when Pebbles was 6 mo and also have never regreted it. They really do keep eachother company and they all sleep in one big ball of fur. My dh is a little upset though because when we only had Coco he would snuggle on his lap. Now he has the girls and wants nothing to do with the lap.
Good luck!!