Hello, I'm going to switch from a 2009 Mac Pro to a (2019) iMac soon and I'm trying to figure out how I'm going to manage my disk space. The easy part is that I'm going to be using a 4 drive enclosure (on USB) for my big spinning drives. I'm going to have a 1TB SSD in the iMac, but I'd also like additional fast external storage. And this is where I'm getting lost with all the options available. What would be a cheap system (specific drive and enclosure, on USB 3.1) for 1 or 2 TB? I'd like the speeds to be at least 1500MB/s. Thanks.