Buy $200k in scrypt-mining equipment from Tiger Direct.  Make sure you get the Square-Trade warranty coverage on *everything.*

Your goal would be to mine as much as you can, but make sure that you run your miners 24/7 as your goal will actually be to kill everything before your warranty expires.  When buying individual components, Square-Trade will reimburse you for the full purchase price of each component when they fail.  Essentially, it's an almost fool-proof way to buy free miners (minus the initial purchase price, which you will get back anyway when your rigs die).  Totally legal, completely legit, and it's worked for me every time.  The employees there know completely what I'm doing and they are always very helpful in working with me.

Edit: I'm taking this post down within 24 hours due to its awesomeness, but for 0.5 BTC ill share this tip.