>My questions are:
>
>- will the HU drive these
>speakers well?

The speakers should work fine with your head unit.

>- should I also upgrade the
>door speakers?

The Blaupunkt's that you have now would go in the door location so im assuming you meant to say upgrade the rear speakers. If a 96 and 99 are the same stereo wise, which i think they are. You should have 5.25" up front and 6.5" in the rear.

>- if so, any recomendations on
>what would be good?
>(I don't need nor can
>afford top of the line
>gear, but want to have
>good quality components to go
>along with the HU.
>Basically, bang for the buck
>here).

Here's a set of 6.5" Blaupunkt's that would work nice for the rear. At $50 they're not that bad of a deal.
http://crutchfield.com/cgi-bin/S-CV47Ye1B72r/ProdView.asp?s=0&c=10&g=52000&I=023PCXT652&o=M&a=0

>- do I need an amp?
> I'm hoping no, but
>I really have no clue
>one way or the other.
>
You shouldn't need a amp at all.