Battery help please

The more threads i read the more lost iam getting . i have roughly 400.00 to spend after getting a 240 amp mechman alternator . Iam guessing alittle under 2500 watts on my system . Ive considered a few options such as :

a single XS d3400 under the hood - not enough left to get a second battery

with the ones below i should be able to find a 2nd battery for the back

Diehard platinum agm 34/78DT ... alittle over 200 locally

Orilleys Super Start agm 34/78 agm .... just under 200 locally

Deka Intimidator 9A78DT ... right at 200.00 locally

Diehard advanced gold agm group 78 .. just under 150.00 locally

Iam i better off with the single xs power under the hood , or a decent agm up front and a second agm for the back ( if i can find a decent group 31 to use ) ? The ones above except the xs power are deka or rebadged deka right ?

 
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