I have to agree with Boo just needing the extra security right now. As to the now or later with the kitten question. I think Cataholic and Jen both brought up valid points, and you're being home would make a big difference - in my opinion.

I think Boo will be just fine either way. He might be needing extra security right now, but he doesn't seem like a stressful sort of kitty and it sounds like he's adapting very well to the whole trip and his new home.

Little Betty is sooo adorable! And Betty and Boo would just be the cutest duo.