I don't know about V8, but for M54 engines, the best bang for the buck is Exide L3 or L5.

I have used both Exide L3 and L5, they are great for the money.
They last about 5-7 yrs.

Home Depot hardware sells them, Exide L3 about $99, L5 about $119.

PS: I do NOT use Autozone Duralast battery any longer, their quality went down in the last 5 yrs, they barely last 1-2 yrs.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT