My audio system may have worn out my factory alternator, and if I need to replace it, I might as well go with one that produces a little more juice so it can better handle the demand for current. I really don't want to go with an all out super high performance unit, mainly because they're so expensive, but are there other units available that have say a rating of 20-30 amps higher than a stock one that isn't quite as expensive as the ultra-high performance ones?