By switching from many, smaller totes to fewer, larger totes I believe that you will see an increase in the length of your grows, an increase in the quantity and quality of your crop, a decrease in the amount of labor needed to maintain your grow, an increase in the stability of TDS, and an increase in the stability of pH.
I'm not in the market for a new system but I have looked around a bit from time to time.
PA Hydropnics looks pretty good as
@Treesomewanted77 has recommended, and
Current Culture and the folks at
Super Closet look to have good offerings, as well. In the spirit of full disclosure, I bought a SuperPonics setup in 2017 and use their
SuperPonics 12 XL, which holds 28 gallons of nutes, in a 2' x 4' tent.
These companies offer buckets in 5, 8, and 10 gallon sizes. I think it's correct to state that plant size will tend increase as bucket size increases and, based on my experience, I'd go with a larger-sized bucket rather than a smaller size.
How many plants? The 12XL has holes for 12 net pots which is, for me, eleven too many. My last few grows (I've only done five grows, one photo grow in 2017 and four auto grows since 2/2021) have consisted of two plants, one of which completely dominates the tent/res. Grows from now on will consist of one plant in the 8 sq ft space. If you're going to use one of the "large res" systems you might find that 4 buckets will do well for you in your 4' x 8'.
And that reminded me that
The Bucket Company has pretty good products, too.
When it comes to res maintenance, there are different approaches (no surprise there).
This site has a lot of interesting info. Check out
this page on res maintenance. I've attached a paper by Bruce Bugbee on this topic, too. And you might want to check out
this video from the folks at Jacks.