You can buy the extended wire for the faceplate from the guy on eBay -- it's in one of these threads. It comes with a wire to extend to your remote speaker.
You don't need a new speaker if you're going to use one of the speakers in the dash -- they put out plenty of volume. I used the one next to the glovebox.
You should take a look at what Convert used to mount his faceplate up high. It is really slick.