I'm not sure what being a single parent has to do with it? I would have though it's based on your own personal needs and restrictions.
I also think it all depends on how you decide on the quality of the school, and what you are your children's needs and restrictions are.
I don't believe that Ofsted reports are a particularly good indicator of a schools 'quality' in the same way that exam leagues aren't. Also, even if there is a brilliantly rated school, they aren't the best one for your child if they can't meet her specific needs or aren't the right environment, if you see what I mean.
Personally, as I live quite rurally, have to travel to work, and have use of a car, the distance of a school won't be such an issue for me. Despite being on the edge of a small-ish town, there are still a number of schools to chose from within a short distance as there are a few village schools, so I'm not convinced I will opt for the closest.
I'm more concerned about a school where I think DS will fit in and get along well. I'm planning on doing some visits and open days next term to have a look and see what I think.
However, if your circumstances mean that distance will be an issue for you, then making that a priority factor in your decisions isn't wrong at all.