I am planning on buying an AMP, but really don't know much about all the spec numbers, and how they translate out. I have seen 1, 2, and 4 channel amps, with wattage ratings all over the place. Any insight on what thi sall means would be really helpful (or perhaps a pointer to a website that explained it?)

Currently I have a deck that is rated at 50x4 (actually it REALLY sucks, skips all the [censored] time when playng CDs), and I have 6x8 Pioneer 3-ways (someone here recommended them, but I don't recall the exact product number now). I think they are rated to 200W?

Anyways, what kind of an AMP should I get (how many watts, how many cahnnels)? I currently do not have a sub, but am planning on getting one, so if that factors into the AMP equation, please let me know. Also, roughly how dificult is an AMP to install? I installed the speakers on my own, but not the deck. So I guess what I am asking is roughly how much more dificult is this job then installing speakers?