what to scroll with and which rings to get

When it comes to the scrolling problem, 3 all stat can easily match 1 attack with some funding, so what you have is basically 6 attack versus 7~8. Personaly, the extra 10-20 attack is not all that fancy if it means spending huge amount of real money to get it.
As for the rings, get Arkarium's P Att set of two rings pre-cubed or cube them yourself.