Mobo: I'd get a B75
for $5 more. It can use more recent processors, and it has a USB 3.0 header that can attach to your case's front panel.
PSU: Argh, too much power. But it's hard to find good low-power PSUs. Probably just step down to the CX430
. Or get a different case with a low-power PSU built in.
CPU: You have no cooling issues in that case. Just get any cheap LGA1155 CPU
SSD : Hm. You don't really need high performance here. I'm tempted to point you to a $60AP Crucial V4, but their (Phison) controller reliability is unknown. If you want a good, fast SSD, you could get a Crucial M4 or Samsung 830 for about $100. But I tend to think that, since you can have three disks in your case, you ought to just use a spinning disk.
HDDs: You want 2TB? Why not get one 2TB disk
? Get a second if you need/want more space. Or upgrade your MOBO
and RAID-1 two of them. RAID is not a backup, but a RAIDed backup can't hurt, right?