Hi,
As I can't tell you much about Prince of Peace or All Saints, I do have a child in 1st grade at St Marks. I love that place. I am sure it is not perfect, and it could have been better. But then... we could say that about every school.
I am happy at StMarks, they work wonderfully with my daughter, she reads without any problems chapter books. I get a note in my mailbox if things need to get to my attention, teachers are available and willing to work with your child as an individual. My child learns there a lot (even after not liking one teacher... she still loves the subject being taught, and after 6 months... she even learned to accept that specific teacher's personality and understands that not everybody is simply amazing). She is very excited about going there every day. She attended Kindergarten there as well... (great experience as well!). There is a lot of rules at the school... but then... I like it, since I am a big supporter of rule following and limits available to a child. Big decision maker for picking StMarks was that is really close for us, and traffic in DFW is BAD in am. It is an older school, so if you are all about the latest bells and whistles - this one may not be for you... I am certain it was the right choice for us :)
Send me a message if you had any questions.