I’ve had good results with Denso and Bosch, but AC Delco has been good too. If you have the budget, you may want to consider new as not all rebuilds are the same - some would just have new electrical bits but they may not have done the bearings. If budget is a concern, you can consider getting a used part from the wrecking yard - that’s what I did as our parts prices are ridiculous in Canada. Net cost in my case was $60, after the core charge refund.I need to replace the alternator. What's the best one to buy? Should I purchase a new one or a remanufactured alternator?