sound system upgrade help

[fedekz986]

I'm not very satisfied with my 99 's sound system (like most everyone else i imagine), and with all the black Friday deals ... It doesn't sound like such a bad time for an upgrade.

I have the stock door speakers + dash speakers.

I went on crutchfield and looked through the speakers to purchase ... For door speakers I went with

Boston Acoustics SR55 5.25" SR Series 2-way Car Audio Speakers
Peak Power: 400 watts per pair / 200 watts each
RMS Rated Power: 150 watts per pair / 75 watts each
4 ohms impedance

And the dash speakers are undecided so far ... Do I need a 4in coaxial or components speakers?

My main question is, what kind of amp do I need, and how many watts? Like a 4,5 or 6 channel amp? 1000w? 2000w?

I plan on putting a subwoofer in as well, but I may just get a seperate mono amp for that if its easier

Thanks!