I will be looking for the 2004 300m special..I noticed it comes with infinity speaker system. For the rear I already purchased (lol with no car yet but i had same set up in an 99 intrepid)..4 Kenwood 6993 6x9 5 way speakers. "I will remove the orig 2 and drill 2 more holes to install the 4 speakers in rear deck. Should I get a 4ch amp and how many watts? Each speaker handles:

Sensitivity 89 dB at 1 watt

Frequency Response 66 - 22k Hz
RMS Power Range (Watts) 2-120
Peak Power Handling (Watts) 500
Impedance (Ohms) 4
Top-mount Depth (Inches) 3 1/16
Bottom-mount Depth (Inches) 3 9/16

I will not be adding a sub...also what size can I get front speakers?