I have more thoughts than these now, about why each of these are important - but they're a good basic summary of what we're thinking about when we shop. And why in some cases, cheapest isn't necessarily the most ethical or godly choice.
I really wanted to bring it back to how these are relational issues, too, which is why put the reminder of the second commandment, 'Love your neighbour as yourself,' and also included the bits about who we were trying to love by making these choices. (And also remind us implicitly that there is a first commandment as well, to love God with every part of our lives.)
I'd be curious to hear about what food priorities your family/household use, and why.