I cancelled my nMP order from Apple after realizing that a) I had a mysterious, unneeded 150GB directory on my 3,1's boot drive and therefore the stock 250G SSD was fine and b) Amazon had the 6-core nMP in stock. After setting it up, I starting running some benchmarks and found it wasn't as good as I was expecting. That's when I realized that Amazon had sent me the 4-core model by mistake! Luckily, 95% of my stuff is on the external thunderbolt raid so I didn't totally waste all that time. So, now that I have the right machine here, I need to return the wrong one. What's the best way to completely and safely wipe all my info from the SSD? Should I even bother trying to preserve the OS installation or just delete the partition out from under myself?