6TBS FULL (NOT 5800TBS MANU FACTURE MAKE THE HARDRIVES INCOMPLETE FIX THAT
7200
4 CORE OR 8 CORE PROCCESING TO PREOCESS THE DATA MORE FASTER STABLE FOR GAMING AND BETTER STAVILITY AND FAST TRANSFER SPEED = THIS IS THE HARD DRIVE CORES
Most gamers do already use WD Black drives, but yes, some SSD caching and more onboard cache RAM above 64Mb might be handy. Sadly the SATA interface is the real bottleneck now.
might be also good to look at drive pairing and do a kit with dual drives, HBA card and have it as a top tier gaming kit, say in 1, 2, 3 and 4TB capacity, in a semi-RAID 0 mode for performance.