As a ret pally, should I need on gear with agi and attack power but no str?

I know everyone says str is king for ret pally, but as I understand it, str really just translates to 2.2x attack power.So if, for example, I have a current piece with (numbers pulled out of my ass here) 50str (110ap) and a new piece drops that has 130ap, should I roll on that piece?What is it's leather or chain?