I can't find any reviews on that PSU but Newegg has it for $59.95 so it's highly unlikely that it's a good PSU let alone a quality PSU. That however doesn't mean that it is the cause of your issues but it could be. I'd try to borrow a known good PSU and test.
I also do not understand why you are running 12 GB. of ram in a dual-channel mobo but if you are mixing RAM then this could still cause issues even if it passed Memtest86+. I'd try two DIMMs only and see if the system crashes. I run Prime 95 for a minimum of 24 hours. You can do faster stress testing with OCCT's "extreme" option. Troubleshooting isn't easy but you can narrow the possibilities.
If you're not aware there have also been a number of issues on OCZ SSDs so you might want to confirm that your firmware is up to date and not one of the problem SSD models.