User blog:DestinySonata/Looking around I found out...

I found out a few things and have a few questions. I'm level 67 and only have 45610 defense.
 * 1) I know that once you become 81, anyone above that level can attack you now. If that's the case, what's the safe level of defense (base level, just in case no skills activate) I should have before I reach this level?
 * 2) How about Attack? I would probably be against super players from then on, but what minimum should I have to even beat the weak? (I only have 49360)
 * 3) As I got the answer that most people use Divina, is it fine to make my defense team Anti-Divina?