I don't have a price range or budget yet. I have no idea of what speakers (good ones) really cost...any thoughts on the Polk dX7's in 6x8 size?

1998 black Contour SVT E0
-KKM Intake
-Magnecor 8.5 mm spark plug wires
-Bosch +4 platinum spark plugs
-B&M Short Shifter
-SPARCO front strut tower bar
-17x7 Rage 5.0's with Nitto NT450's
(215/45-17)
-24mm Aussie rear sway bar