Sorry.. Somehow I missed your post.
When you say killer system, what do you mean??
Loud or good quality sound or both perhaps??
How much do you want to spend?
About installing it yourslef, sure you can (if you know what you'Re doing, it isnt that hard). But for optimal results I wouldnt recommend it.
Alternator upgrade will depend on how *killer* you want your system to be. For usual applications, an alt upgrade isnt totally necessary.
