How large a pool would you run with 32GB of RAM?

So this is the situation I'm facing. I'm getting to the point where I need to plan on an increase in storage space again. Being the digital hoarder that I am I'm currently up to 61% used space on my current pool of 6x8TB drives in a RAIDZ2 configuration. Best Buy currently has a few Easy Store deals going on and my plan was to purchase an additional 6x8TB drives and shuck them to add to my pool. But they also have a REALLY good deal on 18TB drives and I'm tempted to go that route.

My...

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