Here is my opinion,
the battery cables and starter cable, from the factory, is 'just enough' to carry the load on a normal system, the starting system was updated, I think, around 90-91 or so to a different starter, more better, with that in mind, factor in that up grade. You didn't post what year your ride is so it may already be there, in my thread (there is a link in my signature) I noted my upgrade, I don't have any added electrical stuff but the electric fan may be in the future . I recommend one size larger battery/starter cables, the 3g upgrade requires better ground wires also covered in the tech forums for that upgrade, remember on the 3g upgrade there are factory wires that are not used. Very important.
Now as far as battery is concerned, the factory size (cc amps/volts) in my opinion is just fine for most upgrades like the 3g alt. When you start adding amp usage you should do the math to make sure your alt is up to the task when the engine is running at idle and the battery when not running, with big systems that are used when the engine is not running sometimes a second battery is added. Prolly not the case here.
All that said, the battery size from the factory should be fine as long as the charging system is up to the task, as for battery brand, keep in mind there are only a couple actual battery manufacturers, I use Interstate batteries mostly because they have given me hats and signage for my garage and we stocked them at the shop.
This is my opinion and not based on any real automotive electrical experience. Also my car has not caught fire in years