I'd start over. If you've already damaged the factory stuff, there isnt anything the factory has to offer you. New headunit, small amp for the mids, larger amp for the aftermarket subs, replace the speakers, bypass the factory amp, etc. Buy the harness for the new headunit, and then take a really good listen and see what brand sounds good to you, bring youre own cd so you can see what your music sounds like on them.
-There are 10 kinds of people. Those who understand binary, and those who do not.
-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan