So, had the opportunity to buy a set of Pioneer 6.75 woofs and surface mount tweets. The set is the Pioneer TS-D720C Premiere System ( http://tinyurl.com/6jplf8 ). To note: my deck is a Pioneer AVH-P5900 ( http://tinyurl.com/5jrp6c ).
I wanted to mount them on the center dash angled towards the glass so it bounces back to the compartment. The position I ended up with required I mill out the plastic underneath (a hidden part of the dash). Visually it didn't quite turn out the way I had envisioned . . . but at least it sounds awesome. FWIW, here are some pics.
The 6.75 speakers mounted in the doors with the enclosed adapter rings. BUT, they are so deep now my windows don't fully open. Like 3 inches of glass stays up. Damn it.