Speakers are typically rated at continuous RMS watts. Most of the cheaper amps will rate at peak watts to artificially inflate the wattage, but that's another story. Chances are, any decent aftermarket speaker will handle the stock stereo and more.
A lot of the guys like the JBL GTO's, see
http://www.crutchfield.com/S-bGnyDcs...0&I=109GTO607C
Aftermarket component speakers will require a little bit of extra wiring because of the crossover, but it's easy to do. Actually any good 2-ohm speaker will do, of the same size. Crutchfield has a good search engine for this. If you go with 4-ohm you will get a 3 dB drop in volume, and this may introduce distortion because you are driving the amp too much. So stick with 2 ohm unless you plan on replacing the head unit down the road.
Problem with aftermarket subs in the rear deck is, there aren't any aftermarket 2-ohm subs that will fit in the rear deck. You can go with 4 ohm and turn up the gain on your amp, or mount a 2-ohm 8 inch sub on top of the rear deck mounting ring. Or you can keep the stock rear deck speakers, they don't suck as bad as the other speakers.
). I haven't installed them yet, but you can save a ton of $$ if you order them from audiogalaxy at amazon.com
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