Just wanted to mention that volumes 1 & 2 of Mara Pratt's books are available for free audio download here. I've only listened to bits and pieces of them, so I can't really form an opinion.
If you decide that you don't like them, you may want to look at Betsy Maestro's American history series. We're using them this year and love them. (If you use these, you may want to check your library. A lot of libraries seem to carry them.) The pictures are truly outstanding, and the content is meaty without being overly wordy or detailed.