I find the idea of going with 2 256GB drives interesting. Mainly because the price of SSDs are essentially linear meaning a 256GB drive costs almost 2 times as much as a 128GB Drive. Putting 4 128GB drives in a RAID 10 array would give you insane throughput and better redundancy. Just my 2 cents. Obviously this throughput isn't necessary with essentials. The only thing is that the RAID controller will cost you more as you'll need an 8 Port.
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