I am really happy with Abeka.  But it is a Christian based program.  If that doesn't bother you, it is a good one.  I sent my daughter to preschools that used it and I am using it at home to homeschool for Kindergarden.

I have heard good things about Horizion.  But I know nothing about it.

Hope this helps.

Amy

I use www.time4learning.com my 1st grader loves it and so do I! I am about to start my middle child who is about to go into pre-k too. You can use it all the way up to the 8th grade. If you need any more help, please don't hesitate to let me know! Hope this helps! :-)