Best woofer is Pioneer? Please, do some research before you say something like that. Pioneer and XplodSony are about the same quality, they are both -good- and thats about it.
The best woofer undoubtedly is Cerwin-Wega followed by Alpine. You can get a top end CW for RS 15000-25000 and a good quality amp for RS 8000.
Kenwood (and I say this from experience) makes absolutely pitiful woofers and speakers, they are absolutely of the lowest quality.