correct, the speakers will max a 50watts, buuuut, to buy and external amp to power factory speakers is imo a waste of money. You have to buy the amp, the wiring kit, and on top of that, get at the factory speaker wire to wire it all up. Too much time and money to amplify what are prolly crappy stock speakers that are likely to blow from being amplified and the bass turned up.
I just tossed a new alpine deck in. Really nice. It has built in ipod controls. my pod is always in my glovebox chilling and charging, and you are able to control all the features through the deck. Pretty nifty I think. Plus it matches my dash lights perfectly.