ditch the perfect 10 and get the Image Dynamics IDQ10
the Perfect 10 is a nice sub, but is obsolete compared to the IDQ10. Power it with around 250 watts.
You dont really need 6x9's with a sub, so change to 6.5 or 5.25 inch speakers in the rear. I dont think the infiniti components are "loud" or "deep" enough to completely ditch your rear fill. Just make sure to use the time delay feature so the imaging isnt completely hosed up.
Get an Alpine head unit so you have the time delay feature
Forget the Kenwood amp, and get US Acoustics
they are better amps.
http://www.crutchfield.com
Of course, you can get a good component set and ditch rear fill entirely.
A little careful shopping, and you can have mid-high end components for the same price as entry level stuff such as Infiniti. I payed around $2000 for all high end components (but a mid end sub) and I've seen people pay $3500 for stuff that doesn't even compare. Shop around, you'll be glad you did. REmember those $1200 speakers in the store can be had for HALF that or less on the internet from places like sound domain and thezeb
Try the CL-51 on this page
http://thezeb.com/caraudio/CDT_Audio_Components.html
It comes with free rear speakers, and will literally barbeque the infiniti's in comparison.
power the rear speakers with head unit power, and hte fronts at 100x2 or so. (if you chose to even use the rear speakers after listening to the fronts here)
HTH.
[Modified by Kale, 9:21 AM 10/1/2002]