I did some more stereo work today swapping out the factory speakers for JL Audio Components up front and Coaxials in the rear. What a huge difference. The factory speakers are actually pretty good speakers, using poly woofers with silk dome tweeters, however they are barely capable of dealing with the factory amp. The factory speakers are only rated at 25 watts max. Additionally, they are only rated at about 86DB @ 1watt versus the JL speakers at 91DB @ 1watt.
I did not expect that much of a difference, but the system now sounds fuller with better mid and high response. I am still contemplating a new amp and sound processor, but will hold off for now as the system actually sounds pretty good.