are all of these options? or pick one?
are you bottling everything? if so, I would start kegging before anything, and at that volume, don't go and buy a bunch of corney kegs, go sanke. You can get a 15.5 gallon sanke keg for the same or less than a corney, and ferment in it too... For smaller batches, go 1/6 barrels. Get into pressurized fermentation, and transfer using gas!!!
I have fermented using buckets up until now, and is not if but when you will get an infection. There are just more parts and crevices to clean, and it doesn't work...
I do recommend a bunch of mason jars because you just feel more pro, and a stir plate and elenmeyer are cool too!
I would spend the money on the cheap and easy aquarium ferm chamber controller build