Beefy Alternators

Hey good people of the AF! I'm big in to car audio and am wanting to upgrade my system to a real holy terror of a stereo system. Problem is I need a beefed up alternator and a custom built Alt for my Aveo is about $430! I really didn't plan on putting that much money in the electrical. Has anyone upgraded the Alternator for their Aveo?

I would really appreciate some first hand advice.

Thanks guys and I'm sure there are some gals.

$430? that's cheap for electrical that's custom built, i got a new starter built for mine that could handle the CAT battery i've got for $600