Oh my gosh, Jessica, you are going to have the *best* year! Seriously! You've got enough experience - both good and bad - to be able to discern if things are going the way you want them to....and, with the experience under your belt, they'll go fine. Also, the ages of your kids is fantastic. My favorite homeschool years were spent schooling kids ages 6-10. They still love to learn at that age, they appreciate their mammas, and they enjoy the simple and silly things.
Your curric picks look great. You are ready!
I am jealous. Really.
You will have a fantastic year, sweetie. Be sure to post, or really, even PM me, about your experiences. Some of us miss those times dearly.
ETA: Singapore is still my hands-down favorite math program EVER! I am thinking about doing the placement tests again just for fun...for me. Pathetic, eh? LOL!