BEST battery for underhood

[C1500martin 10+ year member]

So my ****** interstate battery went out today so its time for a big boy battery. Space is NOT an issue so whats the best battery for me to have under the hood? Prefferably under $300. Does the bigger the battery mean more power? And also can i use a marine battery for my car? I know AGM is the way to go but what am i looking for AH? CA? 14v 12v? Oh ima be running say 3000rms to be safe and a HO alternator probably 270A. Can i get away with just these 2 things on this wattage?

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[michaellane 5,000+ posts]

So my ****** interstate battery went out today so its time for a big boy battery. Space is NOT an issue so whats the best battery for me to have under the hood? Prefferably under $300. Does the bigger the battery mean more power? And also can i use a marine battery for my car? I know AGM is the way to go but what am i looking for AH? CA? 14v 12v? Oh ima be running say 3000rms to be safe and a HO alternator probably 270A. Can i get away with just these 2 things on this wattage?

You would need a pretty big batgery up.front lol. Look at the AH ratings (amp hours). Get mayching front and back. Batteries