Dual battery questions

[150dbs 10+ year member]

Ok, so I have a yellow top group 34 up front right now in my suv. I am upgrading my stereo system and will be running a Sundown Saz 3000d a JL audio 500/5 and a JL e4300. I will be using a mechman 275 amp alt and I need help deciding what to do for the batteries. Can I hook up the optima to a xs power d3100 and expect to see good results? or a d3400 up front to a xs power d3100 in the back. Is it alright to hook up batteries that are of different classes? I can't fit a 31 series up front but it looks like a good battery for the back. Last but not least I have seen good deals on a optima yellow top d31t. Would that be a good option to hook up to the optima I have now? Would it be sufficient to power my system in your opinion? It would be cheaper for me to grab the one d31t for the back but I wouldn't bother if it ain't gonna get the job done. I appreciate any help guys thanks.

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[infamous_e46 5,000+ posts]

im stalking you so u will buy my d31t's lol

55ah and 75 ah in the rear thats enough support for about 2500-3000 watts

now if you buy the pair i have thats

55ah up front 150 ah rear and a crapload of reserve capacity so it would be damm near bullet proof with that alternator