best quality battery at auto parts store will be good (i run 2100total system rms in my car on bigeest oreilly battery and factory alternator only drop some, if you want more optima yellow tops are good, and if you can find a higher amperage alternator go for it if not, and you still want more power find a place that will beef up your alternator in your car, they can typically get an 80 amp to a 140 thats on small cars so bigger veichles would see a bigger increase