components, speakers, and amps

You choose an amp based on what you want it to do, do you want to amplify 2 channels or 4?  It's up to you.  Use the rms wattage numbers (rather than peak) when trying to match amps to speakers.  Amps are also rated at different loads (4 ohms per channel, 2 ohms per channel, etc.), so keep this in mind.  Pick some speakers you like based on how they sound first, then choose an amplifier.  If you continuously feed them more than the rms (continuous) rating, you will blow them.  If you install a pair of component speakers using the supplied crossovers, you only need 2 channels to feed them.  Your speaker wire will come from the amp to the crossovers, which will split off between the midrange and tweeter.  I suggest you go to www.crutchfield.com and read up on amplifier tutorials.  Also check out www.bcae1.com for more information.  Do a search on this forum on capacitors and you'll find a lot of information.