I buy cereal when it is $1 or less per box, and I get all the free cereal I can to donate to our food pantry at church.
For things like granola bars and fruit snacks I buy when they are 70% off or more, which around here is $1 to $.75 a box.
Milk is something I wish I could save more on, but so far the best strategy I have found is to check my local store ads for the lowest price available that week and then price-adjust at Wal-Mart. Last week I got several gallons for $2.39, which is the best price I have seen for a while.
Shampoo/Conditioner/Stylers I try to get free or nearly free. I might "splurge" for my DD's but it still has to be under $1 a bottle on sale with Q's! LOL!
Toothpaste must be free or a money maker. Deodorant needs to be less than $.50.
I don't have to buy diapers anymore (woohoo!) so I can't help you there.
I love your 50% off to purchase, 70% off to stockpile guideline. I think you will do very well if you stick with that!
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Couponing is the bomb. Tick, tick, boom! 
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