Half Day Kindergarten Vs Full Day Kindergarten

I can not believe that school is about two weeks away. I am so excited Little D will be going to the Elementary School where I went to. What I am not so thrilled about is the half day program they have going on. Kindergarten here is from 830 until 1030. What is that I keep asking myself. I do not feel that is a long enough day for the children. I feel that the short two hour class is for a preschooler. Little D is use to going to school all day. I would put him on the bus in Texas at 650 am and he would be home by 330. I feel this two hour class is not going to be structured enough. I am not sure how they can learn, play, socialize in two hours. When I taught Head Start a few years back I felt the short half day program was not enough time for the children to learn, play, and socialize.
I have been toying with the Idea of enrolling him into the Catholic School here which is an all day program but can not see paying over 3500 a year just for this. Its short of 300.00 a month for the full day kindergarten. Is it worth it? Would I be making the right decision? I have looked into an enriched extended after school Kindergarten program for him. I would love to do that but cant seem to justify spending over 600 a month doing that. If that's the case then the Catholic All day Program is the one to go. I wish the decision would be an easy one for me. I don't want to make a mistake. Is the 2 hour kindergarten program enough, should I look further, what other options have I not stumbled across yet? UHHHGGGHHH. Being a mommy sometime is not so easy. Does anyone have any suggestions???