Yep, motherboards are specific to generations of CPU, so essentially you choose your CPU (for me that's usually a cost based decision) and get a decent motherboard (doesn't need to be top spec but has to be the right one for your CPU, and have the capacity to take the amount of memory you want).
Memory comes in different sizes, I think DDR3 is still the top one so you may already have that (but I doubt it). I expect you know it comes in different speeds, and ideally needs to be in matched sets where more than one stick is in use.
Most ordinary computers are ATX form factor, which defines the motherboard dimensions. Your Dell appears to be a fairly proprietary form factor so looks like you'd need a new case, which often comes with power supply - which you'd need to make sure was man enough to run all those disks - if you really need them all (that'd be a pretty big case...). You could look at getting a disk caddy so you can put disks in an out as you need them, but might just be better to invest in a couple of 3Tb drives if you really need the space.
An SSD C drive with all your programs would speed loading of heavy duty games, and loading the transitions between scenes, but not essential.
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