Seeking advice on the best car stereo, getting close to making a decission Options

[VegasRacer]

I've read all the old threads I can find on the subject. I've Googled until I went (IMG:style_emoticons/default/wacko.gif) .
I have visited most of the audio stores in a 10 mile radius.
The more I look - the more confused I get. (IMG:style_emoticons/default/headbang.gif)
It is getting close to time for making a decision and spending my $$'s.
The casette deck and one blown speaker have got to go. (IMG:style_emoticons/default/ar15.gif)
My budget is $500 max. Can I find something that will make me happy?
Do I need a power amp and / or a sub woofer?

I am favoring the Kenwood EZ500 head unit. It seems as good as most and better than many. I do like the retro look. I'm not crazy about the flip down front to play a CD. I don't need the remote.
(IMG:http://www.infinitecaraudio.com/shop/uploads/im_ez500_lrg_2004_kusa.jpg)

I'll probably go with the speaker pods that morphenspectra sells. Are these really the best way to go? Any recommendations for what I should use to fill them? I want something good. Polk Audio, Infinity, Boston Acoustics. Should I be looking at 2 way or 3 way speakers? I don't want separate tweeter components.

Please help me spend my money. What do you have that you like?
What should I avoid? Any input would be greatly appreciated.

[Series9]

I've always used Kenwood head units in 914s because I've found their CD players to be the most skip resistant.

I did a $550 system in my wife's 911 with an Alpine head unit, Kenwood amp, and Infinity separates and sub. All purchased from the internet after about a week of shopping.