Tales of the 4th Grade Curriculum Quandry

I have been spending hours researching what to do for next year. My inexperience has gotten the better of me. I know I want to do a Unit Study. My reading and research is telling me that learning with Unit Studies is a wonderful way to learn. It may take a lot of planning and gathering of supplies, but the experience of learning this way is worth the hassle for the student. I just haven't seen many of the choices except for Konos. Now, Konos is an award winning program. I even looked around e-bay today at some used selections. I just want to explore all my options.
I hit on the Learning Adventures site this weekend. It seemed pretty impressive.
I am also looking at Weaver. I like that Weaver is customizable for Kindergarten through 12th grade.
Both the Learning Adventures and Weaver use a biblical history format. Which is better? Biblical History format(in chronological order) or the Character Trait study of Konos? I'm not sure.
From what I have gathered, until Laura is a little older she won't truly grasp the flow of history in chronological order. With a timeline and the Unit Study method, she will be able to piece things together.
I have planned some chronology. We have been studying American History. So far, we have studied it in chronological order. I plan to continue this for at least the rest of this school year. It depends on how deep we get into the Colonial period on whether we will study the Revolutionary War or save that for later.
I'm praying for guidance. God led me to homeschooling, so I have to trust that God will lead me in the right direction. Chronological order or not, my main goal in homeschooling is to help foster a heart in my child that seeks God. But, while secondary, it is a concern of mine that my daughter receive an education that is sound, well-rounded, and has her excited to learn.
Money is an issue for us. Again, I have to trust God here. Huge sums for curriculum just isn't an option. I have to plan well and save for important things. However, from what I have read online and in a couple books, many people homeschool for practically nothing with excellent results. My major purchase this spring may not be a pricey curriculum but a good quality printer. I can't believe all the free stuff online that is available for printing. (My old printer wouldn't work with our new computer.)