A couple of other things to think about related to early entry and a full day program:
- How high is your child's tolerance for boredom?  My son might have been able to hold it together for a couple of hours at that age if bored, but he wouldn't have been able to do it for 6.
- How many kids in the class? Teacher ratio?  Here one excellent school has a kindergarten classroom that has almost 30 kids with only 1 teacher, no aides.  My son would have struggled with some of the sensory issues at that age.
Not trying to discourage you.  Just wanted to raise a couple potential issues.