I believe the bearing on my alternator is shot and I am wondering if I should buy from a big box store or if I should buy one from Summit Racing like a Tuff Stuff or Powermaster? This is for a cruiser 318 car and pretty basic. I was thinking like NAPA but, I've heard people have problems with them crapping out every 2 or 3 months. FWI, I already have the amp gauge converted to a voltmeter by Redline. I was thinking something about 60-75 amps should be enough for my purposes. I also see RockAuto has like AC Delco and the likes. Just wondering if one brand is better than the other.