I will try to help you out a bit Mike.
You get what you pay for!!!!!!!!!!!!
The box store paints (HD, Lowes,Walmart) are there for the novices!!!!!!!!!!!!
Even the Cheapest paint from SW or BM will give you better performance then the high end at the box stores.
If you are going to live with this paint for any time span, do yourself a favor and go with ANYTHING but what the box stores have available.
Price is one thing, but if you are going to live with it for 3 or 4+ years, please think what the small difference in cost is to get something that will look good and last -- not even to mention the ease of application and touch up.
Good, I did not have to add to the I hate Behr thread to get my thoughts in.