Originally Posted by fate

You don't need to upgrade your item until you reach 400k I guess, since it will be much money-efficiency to upgrade/ evolve your girls

Except for first time upgrades, just to add on top of your tip.

Originally Posted by nazrin992

For equipment, are the max stats for max level equipment constant for each of them? The main factor that differs their stats is modifiers(0-10), yes?

Max stats between two separate +10 or +anything Warrior Rings are the same, yes. However, a higher +Modifier yields not just higher base stats, but a better leveling efficiency too. IE, a +0 starts at 600 Atk and maxes at 756, a 26% increase, whereas a +10 starts at 1000 and maxes at 1507, a 50% increase.