I will be out of town until Tue. When I return I will be happy to help out better...
I too am a do it ONCE kinda guy, so we will likely share similar opinions. I am know of the compression speaker design, but have not used them and wouldn't be much help. The Qform kickpanels are great for those concerned about time/phase alignment, and if you are very anal about such, go for 'em. The biggest downside to the current locations however is not high freq. response, but mid. It's current location doesn't do much for midrange/midbass, and the Qform would help out that, as well as the aforementioned.
DynaAudio, Diamond Audio, Infinity Kappa, PolkMomo, and Focal are all good manufacturers for loudspeakers.
Nakamichi and Alpine are great choices for headunits.