FWIW...I have 6" up front with only spacers, and 5.25 in the rear doors of my impreza wagon. Minor trimming in rear, but very easy. I picked up audioque stuff and LOVE it.
I know you said PA is so so...but how about 20 bucks plus actual shipping on a blown PA3000db. Need it out of my garage...but don't have the heart to throw it away.