Couple of problems with new build.......

So I just built a new rig this past week. Parts:
i5 3570k
ASRock Z77 Extreme4 Mobo
8 gigs of G.SKILL ram
90gb OCZ Agility 3
750w corsair PSU
cooler master 212+
The SSD is my boot drive, and I've got a 500 gig hdd installed as well. Nothing is overclocked, and I've just been using the integrated intel 4000 graphics because I'm buying a gtx 470 used from a friend in a few days.

Build went fine, but I've been having two recurring problems as of right now.
The first is that I've been getting random BSOD's. They are kernel_data_inpage_error (0x7a). These happen randomly, the computer will hang while the mouse still moves, and then the screen will flash black and go to the BSOD. From what I understand, this is probably an issue with my ssd? I've tried reflashing the firmware, but it was already the newest version. I was hopeful that this had fixed the issue because I did not get the BSOD again for the next day or so, but today I've had it happen twice. How should I go about troubleshooting this, or is there something I'm missing? The ssd is damned fast (when it's working at least), it's just been a headache dealing with it so far.

The next problem is a lot less of an issue but is still pretty annoying. I've had some problems with the USB ports on my motherboard. For some reason, I can't get either of two external drives to connect. These both worked fine last night, so I don't think there is any problem with the drives. I've tried plugging them into the USB 2.0 and 3.0 ports and neither works. However, I can plug my mouse or keyboard into either USB port type and they work. I don't know what to make of that.... USB 3.0 should be backwards compatible with USB 2.0, right?
Anyway, I'd appreciate any help you guys can give.