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Regarding question one: If you really don't have an ear for sound, you'll probably going to think the head unit power is fine. If you are a little particular (which it sounds like you are) you will definately want an external amp. As the volume increases with head unit power, the amplifier output generally gets dirtier and dirtier. Because of this you also increase the chance of blowing speakers, as they are trying to duplicate the dirty siganal but physically can't, overheat and blow. It is MUCH easier to blow a speaker with too little power than with too much.
I would leave things the way they are for now, unless problems develop, but definately replace it with and alternator when you do the motor work.
Jason
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